Avram,
part of my response was not aimed at you, althought it might have seemed like it, you did not advocate throwing people out, but others did.
Ultimatly as a parent you have to make decisions sometimes on what path is “least harm”. If you know your kids friends and generally think they are ok except not religious (Ie college kids at good university) then maybe it would be better to let them be Mechalal shabbos with them, But if you know the kids to be basically dregs of society, Smoking pot and otherwise engaging in “non-productive” or even criminal activities maybe its best to let them stay home.
Being a teen is tough and figuring out your place in society is tough. I know I never want to be a teen again if I had the chance