This is not black and white. It’s not that people necessarily want to be corrupt, in many cases (and increasingly so) there is simply little choice. That’s one of the many problems out there, no alternatives, but that’s another story.
There has been a legal climate constructed within this society which mandates very specific behaviors. In medicine, it’s called the “standard of care.” If you don’t follow this standard, even if you know it is not correct, you’re setting yourself up to get slaughtered. The standard of care is now basically the standard of gaining the highest return on capital investment. This is just the reality of modern corporate-controlled medicine. It’s pretty much the same everywhere else too.
So, it’s not just a matter of being evil or corrupt. It’s much more complicated than that.