Yes you can blame people for being skeptical. Have you seen the pictures of the scale of destruction in Gaza? I’m frankly surprised the number isn’t higher.
The Palestinian health authority has also consistently put out reliable numbers. The UN seems to think so and even the Biden administration seems to try on them internally. I imagine they’re trying to cast doubt on the figures because war crimes like this are frankly a PR nightmare. Biden’s already lost a significant degree of support amongst democrats.
As for the hospital, there’s been no conclusive evidence that it was a failed rocket. You’re showing your bias if you think that we’ll know what happened without an independent investigation. That said, why is it surprising to you that people would jump to conclusions about it being an Israeli air strike? The IDF is dropping an absurd amount of bombs on Gaza. They told people to leave that hospital, implying they were going to bomb it. They had already bombed it once. Even wilder, Israeli officials admitted to bombing the hospital before retracting their claims. It’s wild of you to imply that thinking the IDF bombed that hospital is a ludicrous accusation.