Remember that to a lot of Israeli and pro-Israeli people, "Hamas" just means any Palestinian person of any age or political affiliation, in the same way as "Hezbollah" is now coming to be used to refer to any Lebanese person.
To such a bigot, a hospital full of Palestinians is therefore, by definition, a Hamas base and a valid military target. Obviously, there's no sense in engaging with such a person: they've left both their honesty and their humanity behind.
(Hilariously, nicholas tried to follow me. I think he's just a troll.)