@irvmull
Putting one person to death is not genocide
It's never that simple. Assassination makes them a martyr and just makes the 'faithful' more zealous in their fervour.
The very nature of these individuals makes them charismatic and quick to gain a following. Look at all the people you named "Pol Pot, Stalin, Hitler, Mao" I doubt assassination would have stopped the inevitable, for in order to realise that those individuals were going to be an issue, they had to have existed long enough to BE a problem, and by that time, the damage has been already done.
Time has allowed us to look back and say "They should have been drowned at birth", but the those in power at the time when it really mattered didn't have that level of hindsight. They had to make do with the intelligence they had.
There is always (the slim) chance that people will change. That's why we have prisons and not guillotines.
It's disturbing that you see no difference.
It could also be said that it may be disturbing that I have possibly killed more than the average poster on this site. To some I am a mass murderer, to others I am a hero and patriot. How you view that depends on where you stand, and that's the issue with the likes of Pol Pot, Stalin, Hitler and Mao.