It unfortunately goes both ways, which is why Donald's talk about walls and banning Muslims worked. (And I'm not disagreeing with you here, you are right that t

It unfortunately goes both ways, which is why Donald's talk about walls and banning Muslims worked. (And I'm not disagreeing with you here, you are right that the left has plenty of tribal politics, but it's an issue on the right as well.) People react more vigorously to tribalism than to so-called boring topics like, say, investing in infrastructure or increasing R&D. This sort of polarization is sort of worrisome in one sense; trust is needed to cohesively run a society. (http://www.economist.com/news/finance-and-economics/21705831-new-technologies-will-make-society-richer-cultivating-trust-believing-seeing http://www.economist.com/news/finance-and-economics/21705831...) If we're becoming a low-trust nation overall, that's not terribly good.