The reason Trump hasn't been taken down, either in the campaign or the Mueller witchhunt, is that he has taken the reigns of an electoral revolt against the modern economic and cultural paradigm. That revolt doesn't appear in polls (or is deliberately obfuscated) but it involves a subliminal consensus related to reform of the superstructure of the nation, family, community, faith and the subsidiary institutions that support them (economic, cultural, marital, legal, educational).
All of those have become hopelessly degraded over the last 40 years. It conforms to the founding moral archetype on which Western Civilization is built, and which is under concerted attack by the forces of mulitculturalism, globalism, moral relativism, radical individualism, atheistic humanism. Its prime enemy is the identifiable, moral, cohesive, sovereign nation state.
That rebellion forms its nexus around a man of action, an iconocast. He will be far from perfect, but will subscribes to this vision and will be undeterred in seeing its implementation. Enter Donald Trump. He is likely the most radical reformer that America and the West has seen since the onset of the modern zeitgeist in the early 70s; maybe since Lincoln, certainly since FDR. He is no accidental disruptor. He might be a man of destiny. The front man of a movement whose time has come.