The british controlled the police in northern ireland, Israel does not control the police or other government functions insude Gaza. (As an aside it should be noted that that conflict is orders of magnitude less violent. If the IRA did what Hamas did, i suspect belfast would be leveled) At most israel control their border with gaza (but not egypt's border with gaza) the sea access and air access. A blockade no doubt, but not donestic government functions.
Whether or not gaza is independent is complicated, since they have some features of independence but not others and don't quite squarely fit in either camp. Nonetheless if your suggestion is that israel should have called in whatever their equivalent of a police swat team is - that's impossible because hamas controlled all domestic government functions in gaza. You can't use domestic police techniques on land where you only control the border but not the land itself.
Whether or not gaza is independent is complicated, since they have some features of independence but not others and don't quite squarely fit in either camp. Nonetheless if your suggestion is that israel should have called in whatever their equivalent of a police swat team is - that's impossible because hamas controlled all domestic government functions in gaza. You can't use domestic police techniques on land where you only control the border but not the land itself.