>That might be true, but so what? Keep your identity small. That doesn't say you shouldn't cooperate with people who don't keep their identities small. You can cooperate with people who strongly identify as members of a group without identifying as a member of that group yourself.

You're suggesting acting parasitically toward the group, in that you are gaining the benefits of others sacrificing their own goals for group goals, while not sacrificing your own goals for group goals. That sort of behavior is quite destructive to the group, and groups have (of course imperfect) mechanisms to punish people that behave that way. If you can get away with behaving that way, so be it, but the group has a strong incentive to stop you from doing so.

>It's a property of groups that if they believe the group is beneficial, they'll make compromises to maintain the existence of the group. Each compromise takes them farther from their ideals, until they're no longer really serving their original goals. As a result, I would argue that all groups tend toward not really being in the interest of the members, unless careful measures are taken to prevent that.

In the long term, sure I could buy that. But the short term benefits could easily make it worth it overall to form the group. By the time the group degenerates as you describe, the members could be vastly ahead of where they would have been otherwise.