They're not prosecuting these crimes because the courts are overloaded, and the jails are full to bursting with gang bangers and gun criminals. There has been no increase in the number of courts, and Trump cut funding and staffing in the federal court system across the board.
This drive to cut taxes and "shrink government" everywhere is threatening your basic infrastructure, and national security. Of course the Republicans want to sabotage the Justice Department. And Public Education, and Immigration. Republicans want to sabotage ANYTHING that helps working Americans succeed and growth their own wealth.
Anything that Republicans want to destroy, they first make so bad, they people want it gone, so they can take over and "fix it". Like immigration. Like public education. Like the Justice Department. Like public voting.