I don't know if they have all been killed as human shields, but I see no reason to think that's not possible. All hamas would have to do is to stay places that there are large groups of civilians.
I agree the famine is awful. I've also heard many stories of gazan civilians hating hamas for stealing all the supplies intended for civilians. I really just don't know which stories are true and which are false.
I know that I've been hearing for years how much the palestians hate hamas and hate having them rule over them. They haven't had any sort of elections or anything or any way to get new power there for like 30 years or something.
I know there are lots of people in the west that want to paint hamas as some sort of freedom fighters, but this is not the impression I've ever been under. I see them more like a weak version of the Iranian government, no regard for the lives of their people, and wanting all those awful sexist backwards ancient warlord "religious" teachings to be the official law of the land. Just like in Iran, many people want to join the modern world in regards to human rights, but the powerful over there want to hide behind a butchered version of a "god" to make themselves keep their power.