I think it's a symptom of folks, and especially the media, having to make everything into an extreme to get the clicks and money from an increasingly numb to nuance society.
The basis of the question isn't unthinkable. Certainly there are leaders, even elected ones, that should have been assassinated for the good of the world early in their careers. Violence can be an effective and moral tool against tyranny and injustice.
The problem comes when you start thinking every difference of political opinion makes the other guy Hitler or Stalin. Then it get's harder to make rational choices about when politcal violence is actually called for.
I look at the historical records of Stalin's purges, or Pol Pot's killing fields, and I wonder how folks compare that to disagreements about health insurance, inflation, or yes, even which week an abortion should be allowed. People have no perspective anymore. I'm not even sure I do.
So the real question in my mind is not whether or not assassination is ever OK, but when it becomes needed.