And you know, It's one thing to be dumb. We've had plenty of dumb presidents. I'm a dumb person. I have no room to talk. But at least I know it... is the thing.
It's the combination of being dumb AND arrogant that is particularly scary. Those people who are like, "I may not know anything about what you're talking about, and I don't need to! I know what's best regardless." I stay away from those people in the office, but now we have one of them running our country.
Once again, it's very American. I remember this study a while back - American students rated near the bottom in math and science, but at the very top in self confidence. That's Trump: I don't know anything, but it doesn't matter, cause I'm still the best.