I don't think anyone is claiming that luck drives everything, but in a game with a slim margin of error, luck and randomness, and frankly officiating are not insignificant in a one and done scenario.
More often than not, the goaltender from Maine is going to stop that shot from Matt Koalska, but this one time it worked out. Adam Hauser could have had a penalty called on him late in that third period, but it didn't get called. Who knows what type of difference those could make. Justen Close typically makes a save on that second Quinnipiac goal, but he didn't in that scenario. Call it luck, random, whatever you want, but you'd be a fool to admit that quite often the best team doesn't win in a single elimination tournament.
Doesn't mean you can't be disappointed - I think we're all frustrated to have a 20+ year title drought, but personally I'm not going to act like the entire program is a failure because of it. And for the purposes of being objective, I wouldn't claim that UMass or Quinnipiac are on the same level of UND over the last 20 years despite having the same number of national titles in that span. Unless you want to claim that the whole Dave Hakstol era was meaningless in Grand Forks, which again would be silly.