I'm a researcher and I'm heavily dependent on inputs from my students. If one of them is falsifying data, that's my entire career gone. I know the usual line is "no big deal, another University will just hire the PI" but I don't believe that for a second. Even if it somehow did turn out to be true, I'm going to uproot my family and go through hell because of something I could now avoid?

There are crazy people in the world. But if someone comes to me and says "here is a thing that could end, or at least seriously screw up your career" I'm going to take them very, very seriously. Even if it is incredibly horrifying to contemplate.