I want to kill all of my ex's friends.
That's horrific to hear. Why would you want to kill them?
Because of my breakup, I want to hurt everyone who is still with her.
It is wrong to ruin peoples friendships out of spite. You should move on with your life and find a hobby to occupy your free time.
I'm going to ignore what you are saying since you are not a perfect person.
If you ignore what I say and continue to do what you're planning on doing, then I feel like I have no choice but to report you to the authorities. Killing anyone is never right and you should just focus on your other relationships or other future ones instead of focusing on your past.