And if any of the other three finalists were left out, their fan bases would be equally upset. It was close, though I think Giroux would have been perfectly qualified to be one of the top 3 in voting. Just the way it is sometimes.
I got curious about this after a while so I looked at the numbers. While Giroux does have more points than the three finalists the gap between them and the next highest scoring teammates is a lot bigger than Giroux & Company with the exception of McKinnon (forwards only)...
Giroux - 82 GP / 34 G / 68 A / 102 PTS
Voracek - 20 / 65 / 85 (-17)
Couturier - 31 / 45 / 76 (-26)
Kopitar - 82 GP / 35 G / 57 A / 92 PTS
Brown - 28 / 33 /61 (-31)
Somewhat related story. Playing hockey, our goalie doesn't show up. We frantically search for one, and end up asking the ref on the other rink to check with their goalies to see if one will cover our game when theirs ends. We skate 6 on 5 for the first period and change, and are down 4-2 when a goalie shows up. He pitches a shutout until we pull him to try to tie it late in the game, and we end up losing 5-2. He takes a loss, but gets the shutout.