There is evil in this world, some evil people cannot be helped, they live loveless, joyless unhappy lives.

They most likely grew up in loveless unhappy homes and for that I feel sorry, parents for all practical purposes didn't hug them, kiss them. Most likely they were ignored until it was time for punishment.

At some point they grow up unhappy and determined to hurt others, to disparage and lie at  every given chance.

All you can do is Pray for them, avoid them and know they will live lonely then die a very lonely death, there will be no mourners.

Ignore them and they will shrivel up.