https://www.espn.com/nfl/story/_/id/38370396/ravens-safety-marcus-williams-shoulder-injury
and here is a story about a guy tearing his Achilles a whole two days ago playing on grass. Maybe we just ban the whole sport
I don't think anyone made the claim these injuries can't happen on grass. I also don't know how you make the jump from people wanting to switch back to grass to banning the sport