Because they are weak and can't handle dealing with life a different way.
Just to clarify, it is my opinion that most of what we call "evil" is weakness or indifference. That said, it's more complicated than that, but still good food for thought I think.
same reason they hurt animals...
because they are sadistic, controlling ********
Because they are either horrible parents, or horrible people.
Mentally unstable, unfortunately the government has no problem with stupid having children
good question. probably because they cant defend themselves
Because some people are sick idiots who find it fun to hurt children. Or there drunk and dont know what their doing or that were angry/upset and did it in the moment