Hamas have planned this war. They would have known what Israel's response would be, it wouldn't be diplomacy.
They either believe they can defeat an Israeli ground force invasion or lock them into an unwinnable war or conjure up wider Arab military support the longer the war carries on.
Bombing Gaza to bits before entering could be a bad move. It didn't help the Germans at Stalingrad or the Allies at Monte Cassino. Helped reinforce defensive positions and bogs down many troops in close quarter fighting.
I think Hamas might feel things are going to plan so far.
What do you think the strategy is Frank W, or if there is one?