It's not being advocated. It's being recognised as a problem. He is a loose cannon, but you dont just throw that cannon away and deny yourself a game changer on the bench.
D'you think Dalglish would have sent Bellamy off to the wilderness with a SF in the cup coming up because he'd been his usual undisciplned self?
Moyes is like a boy scout. He needed to bite the bullet on that one, act like a serious player on a big stage for once by getting a one off performance from Drenthe and THEN disciplined him if he felt the need.
IMO, the fact he didn't do that just cost us big time.
I hope he's happy now back at home knowing he has full regimental control of his squad...the ones who'll be watching Liverpool v Chelsea/Spurs on the box in May.