Can't blame Manchester United for losing the game against Sevilla.
They had a good performance and they could easily win the game but the reason for Manchester United losing that game was mostly that they had many personal mistakes against Sevilla and especially the defenders were totally disappointing otherwise we could see Manchester United playing in the final match instead of Sevilla.
The mistake was indeed heavier on Manchester United's own side against Sevilla, because Manchester United would not have lost if the defender had not made this very crucial mistake. But that is in the past for Manchester United and also Sevilla so that both of them will also be in the Champions League next season by giving everything or what they have next season. And it will also be very interesting if they meet again next season in a competition that is even greater than the Europa League.