Well, in the broad sense that you ask the question: signalling ideological opposition to a common-enemy-soldier idea is a way of inspiring in-group feelings among people inclined to that sort of thing. And expensive signalling of ideological opposition to such ideas is a way of providing actual evidence of being part of the relevant in-group for people inclined to evaluate actual evidence. And for most people, actually having an emotional reaction is a much more reliable way of ensuring the unhesitating and convincing production of expensive signals than deciding to simulate such emotional reactions when it seems appropriate.
But I assume you already knew all that, and what you really meant by the question was the assertion that the benefits of keeping one's identity small outweigh the benefits of that sort of social-network management.
Which may well be true.
Rejecting identity as a relevant consideration in your own thinking doesn't obviously depend on hacking emotions. My point is not that one should hack emotions in any particular way, but that it's largely a separate issue from fixing of the more straightforward error of reasoning based on identity (that is, using properties you associate with yourself to bias the thinking about questions that are not related to those properties of yourself).
I was reading a review of Trust in God, or, The Riddle of Kyon. The reviewer went through step by step and listed problems with the fic. Some of them I agreed with, and others did not. What really stood out was in a comment agreeing with it: "reading that fic usually just evoked vague anger and other unpleasantness." Not unlike the vague feeling of anger and other unpleasantness I felt upon reading the review.
I don't consider myself someone whose opinion can be trusted on the quality of the original fic. In addition to being every bit as biased as any hater, although in the opposite direction, I have Asperger's syndrome, and I don't trust myself to notice such things as people acting out of character. However, because of this, I know my revulsion cannot be due to the quality of the review. I looked for it in hopes of weakening any bias I have. I think I can safely say that my revulsion will prevent that from happening.
So, any idea on what I can do? I've always thought haters should just stay away from what they hate. That would work fine if I just hated ponies or something, but I don't think it's such a good idea in cases where ideology is involved. And if nothing else, I don't want a vague feeling of anger and unpleasantness to ruin a perfectly good fanfic, like The Death of Haruhi Suzumia.