As everyone knows, in the NFL, a pass interference penalty results in the ball being placed at the spot of the foul. It could be 10 yards, it could be 47 yards.
In college football, it is only a 15 yard penalty from the line of scrimmage.
Given this, why don’t defensive coaches coach their defensive backs to commit this foul any and every time a receiver is obviously going to beat them on a route? Against the possibility of a touchdown or long gain on a pass, why not just tackle the receiver and take the 15 yards?