Because Markov is so above making terrible mistakes.
This is sports. Of course Markov is going to have a bad play, just don't be idiots and go on claiming that he's over the hill or that Ryan White is never going to be an NHLer or that Budaj is the worst goalie ever or whatever when they have bad games.
It's a single play in a single game. Markov's been great this season, if anything I don't like Emelin's play so far.