Isn't at least half of that purely speculation though? Besides, I wouldn't put it past Trump to do some of the things you just listed anyway. He's not exactly the shining example of foreign policy and PR. Plus I highly doubt that whatever damage Trump might to do will be more reversible than what Clinton might do. 20/20 hindsight when it happens.
I suppose some of it is speculation, but not all of it. There's definitely a lot of shady shit going on with the Clintons. Wikileaks isn't all over her because they want Trump to win, they're all over her because she's a real threat to liberty.
I think Trump is just a shallow showman saying what he thinks people want to hear in order to get votes. I don't think he has any deeply held beliefs, he's just a shit-stirrer trying to become president for the benefit of his business. He just kind of opportunistically reacts instinctively to things and that makes it impossible to take what the positions he takes on his campaign seriously. That makes him a wildcard to me - what he'll actually do if he gets elected is unclear. Will it be stupid? Probably. Dangerous? Maybe, but not likely to be any more dangerous than what Clinton will do. I'd rather choose a wildcard over a devil.
The fact is if he's elected he won't be able to govern unless he moves his position closer to the middle and becoming more moderate instead of appealing to the far right, where he's looking to get votes from now. I'd be very surprised if his policies in office are anywhere near as bad as they are on his campaign. If they are, it'll just push people towards a more progressive president in the future. That'll be like taking a sledgehammer to democracy - it'll piss people off. Clinton's is a slow road to oblivion, like poison.