I'm not keen on conspiracy theories, but there's little doubt that Trump, wittingly or not, is doing the bidding of the Democrats. Clinton's a very weak candidate, but her chances will be boosted running against an unprincipled madman.
We need to keep remembering that, at least so far, Trump hasn't attracted more than approximately one-third of the vote. Far more people are against him than for him. But Hitler won the chancellery in 1933 by capturing only a plurality of the vote. Trump is the present danger, because his supporters are similarly attracted to his "strength" and easy answers rooted in the exploitation of bigotry.