#1 They needed the victory more
Valencia’s win over Young Boys earlier in the evening took the Spaniard into second place temporarily and moved them one point ahead of Manchester United in third.
Manchester United’s lethargic league form has seen them almost out of title contention, while also being knocked out by Derby County in the League Cup, so the Champions League represented the only opportunity for the Red Devils to make headway this season.
Juventus with nine points are almost all but guaranteed a spot in the next round, so they did not have the all-out desire and hunger to win the match as United did, as there was more at stake for their visitors.
Hunger and drive are two of the biggest driving forces propelling football teams to achieve victory, and for a club with the stature and illustrious history of Manchester United, a group stage elimination was out of the question considering what their fans have been through in recent years, and ultimately, this was what spurred them to victory, as they needed it much more.