Trump as Guy Fawkes (is that an explosion we hear in the distance?)

This week, Trump said that he'd default on US debt. This would, quite simply, blow up the economy. This isn't conjecture. It's just a fact. And it's one more way that Donald is showing himself to be an idiot savant, a man who is brilliant at getting media attention but wildly incoherent with policy. It's hard to imagine a more dangerous combination. He could blow up the economy once elected or just blow up the GOP in the general.

I have a simple question. If Trump were intent on exposing the Republican Party's dependence on racism and on engineering a loss not just for the presidential election but of the Senate, how would his behavior to this point be any different than what we've seen so far?