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ElCas said: I agree with tlegower about why they act the way they do regarding the biting/scratches. Their Flaw logic is the one driving this action.
Regarding Point No. 5. Fences indeed are your friends but a some point they will need "bait" to lure them to the fence. So it made sense to go in and take them out but I would have delay the entry time till the Walkers stopped walking towards the fence.
The other thing that gets me is that we have seen time and time again that some zombie "play dead". So if I was in their place, when entering the prison to clear out the cell block I would have hacked/slashed the head of any corpse who did not show any signs that their brains had been caressed by the gentle touch of steel. This would have prevent the bite that Hershel got trying to find Maggie.