I guess it’s more accurate to say that corruption didn’t start with Trump (he wasn’t even involved in politics when Citizens United was happening, for example). The US has been marching in that direction for a while.
The difference now is the openness and also the scale. If a president does one bad thing the press will dig into it, committees will investigate, etc. But what if the president does 20 bad things every single day? The press doesn’t know how to report on that and the legal process is as slow as molasses. And by tomorrow everyone will have forgotten because there’ll be new bad things.
> The US has been marching in that direction for a while.
It's trivial to remember corruption issues from 100+ years ago (I learned about one in middle school with Teapot Dome and political "machines", and those are hardly the full extent) so this is another one of those cliches that is easy to claim but is never proven. There's always some. Humans gonna human. But that doesn't mean either (a) there's always a high and critical amount in magnitude-of-impact OR (b) it's been definitely increasing.
Let's stop saying it as a general trend without examples.
On the flip side, let's keep pointing to all the specific Trump examples.
It's naive to believe that corruption is impossible or vanishingly rare. It's also naive to believe that the current administration is not a major step change.