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But I don't buy that people are reacting out of sympathy for anything. If everyone (at the S3 kickstarter or in general) was protesting very politely and using rainbow emojis, and a couple of big youtubers or sites noticed, the reaction here would be the same defensiveness. People here just don't want any controversy or any bad light near Shenmue. And since the deal is already done, we are team Epic now, and we were also team Epic before the Ooblets thing. The "anti-epic = angry basement dweller" argument is just very convenient and a bit dishonest.
I think you might be projecting your own attitude - ascribing a binary (team this or team that) view onto the situation, and also saying that the people who aren't already down for your cause are intractable. I'm not a fan of any particular marketplace/launcher software. At one time or another I've used most of the well-known ones... Origin, Uplay, GOG, and currently mostly use Steam. When Shenmue III comes out I'll be using EGS. Because I don't care what platform I play it on. And I don't really share any of the concerns that people have brought up about EGS - at least not to the extent that I would change platforms. I don't care about Steam's robust additional features because I only use Steam to buy and launch games. I'm not convinced about the assertions regarding EGS's security vulnerabilities. And I'm not bothered by Epic's aggressive pursuit of exclusivity very much - I don't like it, but it's a common business practice and that's why I "have to" (want to) have both Netflix and Amazon Prime, shop at multiple grocery stores, and so on.
But I did feel like people who wanted the game and expected the game on Steam should be able to get it on Steam or get a refund, so I did my part and wrote a polite message (via KS) saying just that. That's really not a courtesy that I expect my "rivals" in this matter would extend to me, but my expectations are low due to the level of discourse they've displayed. You might think my polite message was useless and it was the explosion of outrage that moved the needle - there's no way of knowing. But anecdotally, I did have a success (along with others who politely wrote them) in persuading the publishers of Dreamcast: Collected Works to correct an error saying Shenmue was a trilogy before it was published.
About this notion of "Team Epic," "Team Steam," or whatever. What you're describing is called "self-branding" in marketing psychology. You may or may not believe in it, or think it applies to you, but the marketing/advertising industry sure does and that's a $1.4 trillion industry, so they take this kind of research into psychology seriously. Self-branding explains why fans of a product (for example, Steam) feel personally threatened when their favorite brand is threatened. Which would explain some of them irrationally, ferociously attacking people who either align with a rival brand (for example, Epic) or people who "dismiss" their concerns.
As I mentioned before, I don't feel an affinity with either Steam or EGS, but I'm not immune to this psychological phenomenon - I do have favorite brands, including Shenmue, Sega, the Tampa Bay Buccaneers, etc. Because of that, I'm annoyed by the nebulous anti-EGS campaign which I view as having ruined the camaraderie of this forum, and as a form of vandalism and trolling that I see in every forum, twitter thread, or available comment field on any article. So I do feel a reactionary impulse that if these "anti-EGS trolls" are ruining my enjoyment of one of my favorite things, I might as well spite them by "rooting for" Epic. But since I don't want to be reactionary and feed into a cycle of futile anger, I make an effort not to indulge in that reactionary impulse. But you have to consider there are some people who will be consumed by the anger, and those are the ones who previously might have been persuaded to share the concerns about Epic, but now are committed to just fighting about it. Now they really are intractable and engaging in trading insults is just a matter of who feels like they can get the last word in - no one is changing their minds, and the cause is lost.
I don't share your concerns about EGS. I listened to them and thought about them and they're not important to me (aside from wanting people to be able to get refunds or get it on Steam). So I'm the enemy now and I must be labeled part of your enemy "team," everything I say is a condescending insult, everything I think is because I'm stupid, etc. etc. Okay, if that's how you want it, but it must be obvious that your cause is lost (for now) because Epic is not stopping or even slowing down. Alternately, you could adopt a longer term strategy and consider me a potential ally who just hasn't been persuaded to your point of view yet. But that would require letting go of the anger, and some people just really enjoy feeling angry. If someone can't get their way, at least they can enjoy letting people know how much they hate and disrespect their enemies for thwarting them. Even if you think this is a misinterpretation or a mischaracterization, there is a way to express that without invective. And that kind of communication leaves a door open for possible future success. If I can't be persuaded to align with every one of your goals, you can think about if there are any sub-goals that I can be persuaded to agree with.
The consumers are people involved in these matters who don't have any direct decision-making power and don't have enough financial power to influence decision-makers. This is obvious because Epic is continuing to snap up exclusives. When someone doesn't have enough power to directly control a situation, the only potentially effective course of action is political, which is the art of persuasion. Extreme anger appeals to a small number of people, and can have some short term effect, but it turns off more people. Being polite, courteous, professional, and persistent in your communications actually is more effective long-term. The #saveshenmue campaign is a great example of this. Even if a positive effort like that is unsuccessful in the short term, it keeps the door open and the lines of communication open for the long term. A vitriolic, bridge-burning scorched-earth campaign will be a failure if it doesn't immediately succeed. A good rule of thumb when deciding on tactics is to transpose the actions from internet anonymity to face-to-face, accountable, real life interactions.