I know that team as I was living there at the time, married to a Leeds fan.
We had a player called Richard Carpenter who broke a player's leg, which ended his career. It went to court when he was sued. I wouldn't call Chippy a thug.
The game hasn't changed that much. The OP is posting nonsense. I watched games in the 60s, & tackles were harder but there wasn't much thuggery, just an occasional player as is the case nowadays. I can remember the likes of Norman Hunter for Leeds, who would commit sliding tackles, but didn't...