I'm curious to know where you think something stops being an "acceptable foul" and starts being a felony. Take this instance:
HS Lacrosse game last year. One of our players hits this guy, real knockdown hit, but is a little off and slams him in the facemask instead of the chest, which is where it was aimed. Helmet pops off (the straps weren't tight enough), kid ends up with a concusion.
Ref calls a slash b/c it was a hit to the head. 1 minute penalty, nothing else.
No questions asked as to whether this was a felony, even though this was "outside of the rules".
I'm not necessarily disagreeing with your point, but should the leagues have guidelines for what constitues an acceptable, intentional foul (intentional fouling in bball, intimidation fouling in lacrosse/football/hockey) and what is simply OUT of line?
I think they should. And I think the primary criteria should be intention to injure. If I'm just pushing from behind on a loose ball to intimidate a kid, fine, but if I'm slamming him into the ground and trying to break his knees, then it crosses over into an area where I personally should be liable for that.
NOTE: I have never, and never intend to, slam a kid into the ground to break his knees.