But they'll still see a player going through on goal being chased by one or more defenders and going down, it doesn't need a lot to join the dots. Whereas a player being sent off for OFFINABUS, or a second caution for dissent, is obviously far less visible and in many cases wouldn't be audible.
I'd be all for a crack down on player behaviour, but it would have to come from the very top of the global game, individual referees, or even individual associations, going after it in isolation would be doomed to failure. I think I'm right in saying that you spent time at L3, so you should know as well as anyone that the AR taking action in this particular scenario would be unexpected and almost certainly not welcomed by anyone in the game (expect perhaps grass roots referees). You stick your head above the parapet and it gets shot off.