Serious voters are not going to .............
I believe we need to realize that (many) Americans are
less serious people today.
They are accustomed to relatively simple, easy lives. Regarding Maslow's Hierarchy, Shelter and food are not problems. For many, higher meanings are things like sports, and sports are moving away from traditional skilled games with manners and civility, to outrageous "extreme" sports and behavior.
I think many Americans see politics as entertainment, in one sense. Sure they know taxes and wars and the economy stem from politics. But so does the nightly news, and it is "entertaining" when politicos get some crazy stuff going in the news.
Trump is putting himself before the public and saying loud and bold, "I will not merely lead and govern America; I will entertain at the same time."