Are you implying that Trump believers with faith deep enough to buy the stock regularly (eg they're not an oligarch/enterprise doing it to bribe Trump) is thinking this logically?
People either vote for him for other reasons (tax cuts for the rich, conservatism, fear for the border or racism) or are deep enough into a cult to disregard anything.
"Abolish our criminal government" by supporting a known member of the establishment with a history of fraud and infidelity. I don't know what can go wrong.
But then again it's a two party system there. So they really don't have a way out and it might seem like the only one.