Exactly the point, players are humans with emotions and different problems going through there head though they are paid for their jobs but that doesn't mean that they won't be on lapses sometimes, we shouldnt always expect players to always be in good form despite how to they train it doesn't really matter what matters sometimes is their state of mind at any given time.
Criticism is normal especially if the club management and the fans have the mindset that some players were the reason for them not to get it right in the previous or particular event but the truth is that Manchester United manager has to restrategize, as it stands all the blame should go to the manager not necessary the players because the job of a manager is to identify lope holes in the team and fix them adequately, so for me, i think the manager should workout modalities and come in with new strategy to put his team in winning part because if this continuous the unexpected may happen to his position.