“Because they’re assholes” – perhaps, but it’s not really a reason.

Is it because as a species we resent when individuals are willing to step outside of the rules of the group?

Or maybe because we feel that we will be in a more advantageous position if one fewer person is competing for our resources?

Or maybe it’s because we are so afraid of our own death that we feel enlivened by the death of others?

Or because we are the most viciously competitive species to ever exist?

Some other reason?