Because people still believe the bull of the last manager that these players were impossibly poor and think Moyes is an absolute genius, when the truth is in-between the two.
Thelwell signed a lot of good players in an impossible financial situation, continued to add to the squad regularly despite money issues (remember those years under Kenwright when we couldn't sign anybody?) and has kept us solvent.
Think he’s done a really good job personally and think he has a better signings record than Moyes at West Ham, given the difference in situations, budgets and status.
Yet everyone hates him. Think it's mad myself.
And for the record, Moyes is doing a very good job as manager. But he isn't a miracle worker - he is getting these players to play to their full potential!
