Perfect blindness to both daily politics and the real mechanisms of how one's society function is naturally perilous. But consider the context of this discussions. The "real" mechanism would be perhaps controversial but mostly not covered under the "no mind killers" rule. Politics as in the politics that most obviously triggers this is useless.

I think we're having a misunderstanding about what exactly we mean by the "no mind killers" rule. Clearly, getting into mind-killing debates with people is worse than useless; that much we can agree on. On the other hand, making a correct decision to bail out ahead of trouble requires that you face the very worst mind-killing issues head-on and make correct judgments about them. (It is possible that such attempts are ultimately futile or not worth the opportunity costs when all probabilities are considered, but there's a Catch-22 situation there, because consideration of at least some highly mind-killing topics is necessary in order to establish this.)

However, when people speak about avoiding mind-killers on LW, they often have in mind complete cessation of thinking about such topics and living under the assumption that the status quo will continue indefinitely, or all until some grand technological game-changer. (Worse yet, sometimes they go further and privilege the hypotheses on controversial questions favored by the respectable opinion and official intellectual institutions, and consider attacks on these, but not adherence to them, as mind-killing.)