I think some of them think that some of the problems aren't going to be fixed in the short term and that those problems are serious enough to have a knock on effect on other things.
They also want to judge him on his performance here rather than anywhere else.
I understand that but neither of those things makes sam immune to criticism
On the surface that is all fine and sensible.
However, they then go on to attack people for judging him on performances.
The short/long term argument is also decent. Except when you realise we were capable of beating 'worse' teams when he came in. We were capable of being solid when playing 'better teams' (Liverpool & Chelsea come to mind).
So it is clear the squad & team are good enough to get results/play football.
But we've just abandoned it all recently.