I'm going to allow my 17 year old female friend to be with a 31 year old male sexually violent offender
Why would you let them be alone together?
She got dumped by her boyfriend earlier (and she was really bummed out). I don't want to see my friend like that.
Your friend is a minor, and the guy you are setting her up with is a full grown adult with a violent sex offender record. Not only it is illegal for him to have sex with a minor, it is also dangerous for your friend to be with someone that has a violent offense in the past. If you continue with this, you would be putting her life in danger.
They had sex once and everyone is ok.
She's not okay if she has had sex with a violent sex offender. Even if it was consensual she is under 18 which makes it illegal. Don't you want to protect your friend?