Brennan is a fucking retard. No, you don't want to know. You want to signal affiliation with desirable groups, to send hard-to-fake signals of desirable presonality traits such as loyalty, intelligence, power and the presence of informed allies. You want to say everything bad you possibly can about the outgroup and everything good about the ingroup. You want to preech altruism and then make a plausible but unlikely reasoning error which conveniently stops you from having to give away anything costly.

All the other humans do all of these things. This is the true way of our kind. You will be punished if you deviate from the way, or even if you try to overtly mention that this is the way.