We all know that one of the problems experienced by Manchester United is their fragile defense. They improved when they had a new duo, but the fact that they haven't performed consistently every game is a problem too. Now before the league starts and Onana joins the club it's a breath of fresh air for them, and Onana's arrival is also a situation where they have to lose De Gea who I think is still performing quite well.
Now is he (the goalkeeper) to blame when many concede but with a fragile defense? if many blame him I think it is unfair.
Even though Man United is having a bad performance at the moment and they have suffered a lot of goals so far but I think it would be unfair to blame Onana for causing all of that because no matter how good a goalkeeper is, if the defense line performs poorly, then it will be difficult for goalkeeper to get a clean sheet. A defeat will always be a shared responsibility.
It's not appropriate to blame just one player when others are not playing as expected. We have to look at this as a whole and openly judge the performance of players. Just as De Gea conceded a lot when he was here, their defense is fragile and even more annoying when the same players make the same mistakes in defense.
Actually, many clubs have experienced this MU-like, and I rarely hear a goalkeeper being a scapegoat. Except for the time Liverpool experienced in the Champions League match. It was indeed seen that their goalkeeper made a fatal mistake so that Real Madrid beat them at that time.