If it was a command post then there must be a path for Israel to attack. It’s not like Hamas gets to use “one weird trick” to exclude their command center from being a valid target.
If Israel thought it was a military target, did every thing else right, but sucked up then it’s a sucky product of urban war.
If Israel knew it was really only a hospital and attacked anyway — then they are morally and strategically fucked. Rightfully so. (Kinda like how other countries have also overreacted to a terrorist attack and gone after the wrong target).
And of course the reality of all this probably doesn’t matters because a large number of people make up their mind first and from then on ignore and other intelligence even when it’s gathered.