A lot of Americans believed the guy they wanted to believe in, because they didn't want to believe the people they didn't want to believe in.
You're assuming that modern politics across most of the World has something to do with rational, logical thought. Russia, China, Europe, the US, the Middle East - they are all in a quagmire of irrational fractures between the public and the political classes who want power/control for benefit of themselves rather than for the benefit of that public.
It's not unique to the US, it's just that they look like they are speed running it from outside.
You're assuming that modern politics across most of the World has something to do with rational, logical thought. Russia, China, Europe, the US, the Middle East - they are all in a quagmire of irrational fractures between the public and the political classes who want power/control for benefit of themselves rather than for the benefit of that public.
It's not unique to the US, it's just that they look like they are speed running it from outside.