NyQuil
Big F$&*in Q
The point is that it wasn't a headbutt in any meaningful sense of the word. Pretty much every single shift in a hockey game features slashing for instance, but it's only called a few times per game, because even in IIHF tournaments they show a reasonable amount of discretion in order to keep to the spirit of the rule. Headbutting is a punishable offence because there is potential for injury. Veleno's "headbutt" had no intent to injure and no possibility of causing injury. To suspend for it is a joke, just as calling post-whistle scrums fights would be a joke or calling every time a player's stick hits another player slashing would be a joke.
There's no hockey-related reason to hit someone else with your helmet.
Slashes and other typical penalized plays are often hockey plays gone wrong.
It's one game, it's cautionary to everyone in the tournament. I don't really have a problem with it.