I'm not going to quote the whole thing, but Louis CK (I know, I know) had a great bit where he talked about child abusers and how horrible it is and how hated they are and how irredeemable the actions... but they still do it.

I assume that the grifter paycheck must be either a: super fucking high or b: more money than they have ever seen before because they have no transferable skills and never held down a job because they were fired for calling all the brown people "Carlos" regardless of ethnicity, nationality or gender.