There's no room for two spinners on a flat, slow wicket, so I think Anderson is not a bad choice - at least he has done some of it at that level, even though he is out of match practice. I think Monty will come in later in the piece and be all the more effective for it.
As for Harmison, there surely is nothing worse for a sportsman of any kind than to be dropped from the team, so the fact that he can't yet be trusted to open the bowling is the lesser evil for him. I don't for a minute believe that Harmison is unaware of the issues, and feel sure he will have been involved in the discussions as to when it will be best for him to bowl.
We need to trust them, and I think that being cautious when confronting the best side in the world in their own back yard is probably on the right side of sensible. Let's be patient, wait for the third and fourth matches - they count for one point each as well!