Hospitals in Israel are generally guarded the same way hospitals in the US are: by police and security guards. As opposed to Hamas, the IDF doesn't use hospitals as bases. They don't build terror tunnels under hospitals. They don't take hostages to hospitals and kill them there. They don't shoot from hospitals. They don't store weapons in hospitals. Hamas does all of those things.

IDF personnel are in and out of every hospital in Israel all the time. Every other adult in Israel is IDF.

Israel has attacked every hospital in Israel with the blanket claim that some Hamas person was there at some point. Not that there was active fighting at the hospital. Not that Hamas was barricaded inside and firing out of it. Just that someone however loosely related to Hamas might have been near the hospital at some point. By that same argument, virtually every building in Israel would be a legitimate target.