I agree there can be all sorts of reasons for the attack, but I was responding to the claim / suggestion that it was a deliberate attack on the UN by Israel. That's not a reasonable default assumption. Bad intel or some other misunderstanding is a good default assumption, until evidence shows up to suggest otherwise.

As for IDF investigations: the Dutch air-force accidentally killed 70 civilians in Iraq in 2015. It took almost a decade for that to come out. And because of a whistleblower. It was hidden from Parliament too. Militaries around the world are not known for transparency. So we may indeed never know. But stuff leaks, and whisleblowes are out there.
https://www.amnesty.nl/de-aanval-op-hawija