Incorrect. The number of people willing to risk their lives for greed would naturally reduce as the risk grows. The unpredictability of targets would increase the risk factor for them.
And laws can be bought, as we’ve already seen. Making them fear for their lives will buy results like no laws ever could. That’s exactly how we got most of our labor protections.
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: