I mean, what do you really want them to do?
Anything that they release will just be dismissed as fake by people who have already made up their minds
They've said they weren't conducting operations there. They released radio intercepts of Hamas fighters describing it as a misfire. Photographs of the site look nothing like the blast site of Israel's bombs. We know there was a volley of rockets launched around the same time. We have video of one apparently malfunctioning in the air shortly before a ground explosion. We know that Gazan rockets routinely misfire and cause civilian casualties.
Meanwhile, Hamas supplied no evidence, and said that they'd essentially flattened a hospital with a bomb killing 500. In reality, there was a small explosion in a parking lot, the hospital is still standing, and it seems to have been perhaps a few dozen causalities. Shockingly, the terrorist group seems to have little journalistic integrity.
I think it'll take longer for us to get definitive proof, but the evidence we have points pretty much in one direction.
Also, if Israel really had wanted to destroy the hospital, it wouldn't still be standing. You can't really reconcile Israel is a monster that destroys hospitals for no reason with the fact that all we can see is a scorched parking lot.