Can't say I agree with Torts on much there.
The responsibility of policing what was going on the ice was taken away from the players because all it did was was result in spirals of violence. Players coming out of those eras were famous for the way they liked to try and injure their opponents(going for the knees, elbows, head hits etc), and all you needed to do to get away with it was be a better fighter than the guy who would object to your bad behavior(or someone who could do it for you).
Reason why the league has turned into a no-hit league with all the new rules surrounding hitting itself has more to do with the concussion panic of the last decade as well. You basically cannot throw a big, old style hit like you used to without some trauma to the head(either via direct contact, or the brain banging around in the skull). Players don't want to get taken out of the game with things like concussion protocol, and they especially don't want to get suspended or fined for throwing a hit followed by getting dragged through the mud by the media and fans afterwards, The silly post-hit fights that have become common-place are probably nothing more than a slight inconvenience out of the whole deal for players capable of throwing those big hits on the regular. Also have to consider the fact that the NHL heavily cracks down on players(including running some out of the league in the mid-2010s) who injure others with big hits(a significant risk most of the time), and the media, sponsors, and significant portion of fans have no problem piling on anytime anything like that happens.
Hitting, especially big hits, are effectively dead as a tactic in the NHL. It's being taken out of the lower levels where kids might learn how to not only throw them, but also take them, and as Torts was complaining about - everyone already plays the game like they don't expect to ever be hit.