What matters is that if he doesn't live up to at least some of his promise in an obvious way, his support will crumble and the next cycle will go to whatever foetid creeping thing crawls out from the far right.
He may have screwed over supporters before, but the country as a whole is too big to screw over, and he doesn't have the luxury of doing that again. His charisma buys him some breathing space, but there has to be some delivery and pay off too - he's not going to be able to fool all of the people all of the time.
As for trusting his wisdom - why? Things will get better or they won't. Wisdom isn't the issue - results are.
