Communicate the correlation.
The imported third world population brought with it third world behaviors.
Really not that hard to figure out.
We had a few “education reforms” when I went to Catholic school. It was called a little Irish priest with 2X4 sized yardsticks. OUCH
In grade school we carried our guns to school so we could hunt for meat on the way home. We had to leave them in the coat room though. In High School, Lincoln, Nebr there were any number of guns left all day in pickup gun racks. Sure we had fist fights but never more than that.