Are predators(human) a way of nature trying to thin out the heard?

In nature we have prey and we have predators. I will use the explanation my teacher in biology gave me for this. The predator the fox is always smaller than lets say the rabbit population. The rabbit population could be maybe 70 while the fox population is 20. With a lot of rabbits the population of fox grows. Though with too many foxes around there is not enough rabbits and some of the foxes die and become smaller. Which allows more rabbits to be born.

This is the rule of nature. With no predator to keep the prey in check eventually the population dies from starvation. This is only one way life regulates itself. There is also things like desiese and this is something the human race gets none of. Nature gives us the instict to protect ourselves. So when we get predators(criminals) we lock them up or kill them.

Yet if you look at this from a evolutionary point are we suppose to do this? We have people who seem to be born evil and have no remorse, no pity and want nothing but to make another person suffer regardless of the consequences. We also have people despite teaching us safety rules as children will gladly run to this person and not understand why this person would make them suffer. Despite the fact society has made these safety rules for a reason.

So are these seemingly soulless people just a way of killing off the morons? That seem to be asking for their own demise? In nature these morons would be dead but in society we try to save the idiots. No matter how stupid we know they are. We try to save them and after awhile you realize you cant save people like this.

In nature they would not be alive anymore but since we took out the obstacles which thin the heard they exist. Now I am not talking about people who suffer from things like bipolorism and Schizophrenia and those such things. I talk about people that torture small animals and slaughter people just for the fun of it and while doing it will have a smile plastered across their face.

Than the people who knowing these people are going to hurt them say "Lets hang out mr.predotor." Now no I am not saying crime is good. I am not saying these people are good for the world. However some people are clearly too stupid to be existing without the rest of of keeping them out of trouble.

The people who turn out this way are random as well. Sometimes people who come out this way have no reason to be angry, they were not beaten as children or ever mistreated. They just come out like monsters and no one knows why. Of course this kind of attitude can be made but sometimes it just isnt.