Please read this and answer and tell me what you think?

I'm really mad right now so please forgive any misspellings.I was just talking to my parents and they were telling me that a friend of theirs daughter is pregnant for the 3rd time here's why I'm mad she is HIV postive from when she used to be a hooker.I want to take a gun and shoot the b*tch.She's sleeping around and not useing protection and it makes me sick what do you think about this.And should I go to the proper authorities?