That's the main problem with humanity. People stop, fearing that all sorts of stupid and inconsequential things, like human life, happiness and prosperity are not worth sacrificing for the greater good. They sometimes stop when they are so close that all of humanity would benefit. One study claims that Stalin only needed to shoot approximately 5 more people and the USSR would have become a true workers' paradise. Think about that! Just five more people. He was so close.
Would it have worked with just any five people? Best outcome is Stalin shooting himself 5 times, maybe.
Some people say that bombing for peace is like f#cking for virginity, but f#cking is literally the only way to make more virgins! And the same people say that killing a murderer just makes you one more murderer. But if Stalin kills 10,000,000 murders then the world is down by 9,999,999 murderers. Fewer murderers total, PLUS the quality has gone up! A dude that kills 10,000,000 people is clearly a top-notch murderer.