I think it would have stayed on the ice if the media hadn't brought it up. Neither player said what Lucic said - that came from the lip reading skills of the media.
Only an idiot would think that after a game like that, there would not be cameras all over them, recording every syllable out of their mouths. Heck, Lucic got caught days earlier Cowbell'ing a player behind the play, didn't he learn from that?
Sure, in the beer league, what happens on the ice stays on the ice. But when you get paid millions to play, and you have 27 cameras on you, its worse than any other celebrity and paparazzi. There is no expectation of privacy on the ice. Especially during the Stanley freaking Cup playoffs.
Again, he physically assaults a guy outside the realm of play (the player did not have the puck, and was not involved in the play when he tried to castrate him), and then he utters a death threat to another player. Do either of these in a bar, and you are open to criminal charges. Put on a hockey helemt and it just "part of the game".
The sooner they remove these shenanigans from the game, the better. Or, quit putting up the pretense, and bring us Rollerball on Ice.