First, the only reason to vote for Trump is that you think he'll do a better job as president than any of the other candidates.
Second, though, what has he actually said - consistently and reliably - that makes you think he'll be a step in the right direction?
His apparent disregard for political correctness coupled with the level of panic felt by the establishment at the proposition of him winning are enough for me. I'm not prepared to go along with more of the same. We aren't electing a king and none of the candidates gets to change everything overnight but if he can at least slow the bleeding a bit it's a step in the right direction.
Second, though, what has he actually said - consistently and reliably - that makes you think he'll be a step in the right direction?