So after spending huge amount of money on sign on fee for new players there shouldn't be any excuses from Erk ten Hag after all he opted for players that fit his self of play or tactics thus he should be solely held responsible for Man Utd dismal performance, meanwhile in case of Casimero error against Liverpool two obvious errors is two much for a quality players like him and Erik ten Hag must have knew how well his players are during training recall the youngster that replaced Casimero in that match against Liverpool even played better, while another quality player in person of Sancho was loaned out to Chelsea by the manager luckily Sancho is in-form and playing well for the blues.
The reason here while Ten Hag will constantly face more critics rather than the players is because he did signed most of them and they have failed to meet up to expectations, is like what Ronaldo said before they're not ready to compete, all they care is probably get a local trophy but the league title and Europa trophies they're not just ready for it, this is how far Manchester United has fallen and Ten Hag didn't realise this earlier and that was why he could brag or raise his heads up high after getting the Carabao Cup and FA Cup.
Outside getting these trophies nothing as really changed in majority of the players development or consistency and so they can't perform well enough in top competitions in Europe and EPL.