Playing devil's advocate here. Why are you allowed to plow over the catcher, but you can't plow over a 1B,2B etc? The gear a catcher wears is made to lessen impact of baseballs it does very little to help with getting running over by a person going full speed. On ESPN's sport science this morning they showed that a guy hitting a catcher is delivering 3200ish lbs of force. That's more than a QB taking a hit from his blindside.