How do you spin being a unknown quantity as a good thing?
"Fuck it, let's see what's going to happen!" is truly awful reasoning for electing a President. It's a tiny bit better than the "Fuck it, burn this motherfucker down" from all the 4chan style Trump idiots, but not much.
it's not that he is the one, is that Hillary is 100% sure pick to not solve them. Her record on interventionism, trade deals, wall street is terrible. So small chance as it is that Trump will succeed at any of these areas, it is a better chance than Hillary, who is good pals with Henry Kissinger and sees ME as a 'global chessboard' in a game vs Russia and spoke for EVERY intervention once in office. So while I'm not sure Trump would do what he says, and even leaning to 'no' in most areas; I think it's still a chance he will do better than Hillary, chance worth taking given her record.
There's no evaluation of the downside of electing Trump in there.
Success as President doesn't come from a random number generation, and he hasn't given us any concrete demonstration of his upside. But the downside? We could invade Iraq and hand the oilfields to Exxon, we could torture people's families. It could all be a long con for personal enrichment and power, see:Berlusconi, Silvio.
We're not exactly on the precipice of imminent doom, so I don't know how taking a massive flyer on an erratic character with all Trump's demonstrated downsides is a reasonable risk to take.