Personally there's some people that I hate (like my middle school bullies), but there's nothing for me to gain out of killing them. I would only be arrested and put into jail. I think that life kills everyone in the end anyways, and I like the thought of them slaving away under capitalism and becoming mindless cogs in the system. They deserve to become slaves to the system and become old and wrinkled shells of their former selves. They deserve to suffer through old age and get debilitating diseases like Alzheimer's and dementia.
There's no need for me to personally kill or take revenge on them, life will do it in the end. They deserve to suffer because they're terrible, horrible human beings (literal psychopaths/sociopaths) and life causes endless amounts of suffering. If they're dead, they won't be able to suffer. That's why it's better to not kill them and instead let them go through adulthood (modern day slavery), middle age and old age, and eventually die of pain and agony due to natural death.