If the insulting egomaniac Trump manifests now is the "real" Trump, if elected, he'd be nuclear armed insulting egomaniac President Trump. What if he got into a nonnegotiable public conflict with another nuclear armed insulting egomaniac like Kim Jong Un or Putin? As a candidate he will (and should be) "Goldwatered."
On the other hand, the main problem with "Gentle Ben" Carson is not his association with a felon or his tendency to embellish his life with unverifiable anecdotes. It is that he shows no evidence of broad knowledge necessary for serving as president of the most powerful nation of the world and no critical thinking ability to inquire independently. Reliance on bad advisers is precisely the flaw in Bush 43 that resulted in 8 years of catastrophic decision making!