It might as well have been the guy next to them and they still don't care. 10 more won't have any impact. 100 more and you'll just invoke a strong resistance and crackdown.
You could stop an infinite number of bad things happening to bad people by just promoting progressive political reform, instead.
Let me compile a list of times a sequence of fringe nonpolitical group's assassinations resulted in progressive reform out of all the many many countries with universal healthcare: