Firing Ten Hag would indeed be easy with the performance he currently has but the problem is whether after Ten Hag leaves there will be a guarantee that Manchester United will change drastically with a new coach because if in the end the performance remains the same then they themselves lose in addition to financial terms because firing will require money for compensation and finding a suitable new coach will not be easy and require even more money in the end.
Sacking Erik Ten Hag won't solved the main current problem of Manchester United. The players are suffering from fatigue and some of them are in their worst form this season. It's not everything we should pour blames on Erik Ten Hag, rather we also should look at the present matter, players during games have failed to improve their qualities and performance, rather they succumb to terrible stats which is having a negative effects on the team. What United needs at the moment is excellent players that will bench the present ones, specifically the ones that's not performing upto expectations.