Could any of our American friends explain to a dumb Englishman....?

1) Donald encouraged a mob to attack the White House and Democratic Process.
2) He has systematically lied, and every so often there is a news story about criminal behaviour - but he's never been arrested. Why?
3) A great political party seems to think he is the American citizen most fitted to lead and represent your country.
4) millions of Americans want to vote for him.