I think the way Israeli govt sources pushed several videos and tweets then redacted them over the hours until they could find something somewhat sticky enough just for Joe Biden tells us everything we need to know. (remember, the guy claimed to have seen the beheaded babies and cant talk 3 sentences without mumbling without reading his notes, he is also surrounded by actual zionist neo cons and war mongers like Blinken). Another important point to note is that parking area was p a c k e d. This isnt your typical parking area where you have just a few empty cars parked. People are packing in wherever they 'hope' its safe. 100-150 ppl are staying in places where normally 5-10 ppl would stay. (according to Palestinian UK ambassador).
It also follows Israeli SOP, deny deny, spread false info, and then admit it when no one is looking. Evidence provided by Israel is not fool proof and there have been several logical refutations. At the same time, we will never have a 'smoking gun' either. But given the history, trajectory of events, statements (and redacted statements post-strike) & threats from Israeli officials, the probability of Israel doing it is far more than a random heavy rogue rocket falling precisely over a hospital. Palestinians have shot how many? 30,000 + rockets on Israel over the years, causing 30-40 casualties?.
Apart from that, I mean it's Netanyahu...nobody actually believes a word he says, not even his own people. Backed by Biden, throughout his political career, he has been a staunch pro-war hawk and huge supporter of apartheid and occupation. AIPAC wont let you have a beautiful political career otherwise. Biden would've said Martians did it if Netanyahu said Martians had done it.
US's own bombing of civilians investigations would take weeks and months, but Biden had it all figured out it hours once the Israeli PR ops team sorted out a decent enough narrative after several false starts over the night.
Israel did it.
Also, nothing can deflect from the fact that Israel has killed over 1,000 children in Gaza in just a few days and dropped more bombs on Gaza in a week than the US did in Afghanistan in one year.