Sticky family situation

I've known my husband and his family for over 11 years now, my BIL has been my bestfriend for years. 4 years old he returned to his country and our relationship hasn't been as close. About a month ago he started posting family member who were involved in sexual assaults a total of 6 monsters and i can't count how many victims. His first post was along the lines of come out and turn yourself in and i won't expose yall. Things got ugly pretty quick and next thing you know he posted conversation and photos of the monsters and how he was a victim himself and refuses to continue to allow this happening to other family members. I was baffled being that these are people i spent time with at family events. My issue right now is that these are people who obviously know where me and my husband live with our children, we can't financially afford to move right now and because the acts happened years ago the authorities "can't" do anything about it unless someone is harmed. We've received calls from that side of the family asking us to speak to my BIL and tell him to take everything down due to businesses those family members have and even though other family members know what happened they refuse to turn their backs on the monsters because they're the income of the family. My fear is that if this doesn't stop something will happen to my husband and our family.