He has the worlds biggest media empire behind him, numerous other bii ohg media outlets, the US in particular and the West in general has spent the past forty years promoting “character” politicians rather than competent ones and what opposition there is politically are crippled by careerists / geriatric careerists who absolutely refuse to change or to get out of the way. Oh, and nearly all sides refuse to change an economic system which has spent at least a decade impoverishing the majority of electorates.
So I am not surprised Trump is still supported by millions of people; he is appalling, probably a traitor and has wrecked the country but when the people in charge refuse to do anything about him, what does anyone expect is going to happen?