It's a dangerous game. In the spring league I play in we had a guy die on the field this year - took a shot to the chest which ended up at chin, and IIRC the details correctly snapped his neck which basically caused him to suffocate there on the field.
Last year we had a guy who just dropped his head for a second and went crown first at a linemen on a short yardage play, just dropped like a log, was paralyzed for a bit and had to be airlifted off. (He's ok now, he actually played in a playoff game against us later in the year)
Broken arms and legs and torn ligaments are one thing, but this is some serious stuff. I don't think it should be banned, but I wonder if it would be better with some equipment changes - less, not more. Granted the pads aren't an insane amount of protection, but having your head covered makes you a little less cautious, and I'm not sure that's always a good thing. But I'm no doctor, so I really don't know.
Noone's forcing anyone to play, and there are certainly far more dangerous things you could be doing, lol - I just wonder if there are changes that could be made to reduce the unbelievable violence of collisions.