We're not talking about "some physical pain" here, guys. We're talking about people turned into walking vegetables, or stricken with debilitating mental illness. Check your bloodlust. A big open ice hit is entertaining, but I'd gladly give that up if it means cutting down on concussions. That you value your own fleeting entertainment more than a human being is barbaric.
And regarding the whole "but they're adults!" thing, this stuff trickles down to the peewee level and beyond. Kids are literally dying because of it. But god forbid someone suggest there are more important things than a safety obliterating a running back.
There is no "freedom" option here. You either think violence and bodily destruction is a fair cost for entertaining you, or you think the world would be better if those people were able to live full, healthy lives, even if it meant losing some of the physicality in your precious sports. Either way, you're "choosing what's best for people." The difference is, in one of them, you get to be a humane member of a society.