I think people are getting angry at the symptom and not cause.

The cause is that children and teens don’t have anywhere to go, so they all went to the library. I imagine you have different groups of children/teenagers interacting with each other causing problems.

Instead of getting mad at the library, we all should be getting mad at community for not providing other options for children/teenagers to go. Places like skate parks, community centers, drop in programs, etc. places were children/teenagers can go hang out free.

Edit: Cleaned up mobile typing errors