You have my sympathy. I think I understand what you are going through.
My kids grew up with the kids of another local family. We were in the same social circle, went to the same church, etc. They faced a horrible crisis and the family really fell apart. Even before that I had concerns about things that were going on, but when things went really downhill for them, I had a hard time cutting off the kids because I felt so bad for them. But eventually, I did not allow my youngest to see them anymore because of some of the dangerous things I found out about.
I was worried that one of mine who went to school 40 minutes away would have the same problems you are worried about, but like others have said, she made her own life once she went to college.
However, I am still very worried about my youngest because the younger kids from that family were much more affected by what happened, and my youngest has a very strong emotional connection with one of the kids. The most likely college for her might be the one that’s 40 minutes away, and I am questioning it everyday how much it’s worth sending her farther away just to get a fresh start.