Agree with all of that. But it doesn't make it clever to stick the boot in to a player he's already humiliated. I've no issue with the substitution itself, in fact it's good to see a manager unafraid to do that.
Also an early tactical substitution highlights failure in the original line-up. He deserves as much criticism as he does praise. If people on here were even saying Watters isn't up to it, you have to wonder why he picked him in the first place!