eh....I'm not sure the 1400 figure is in dispute but a lot of the atrocities are. Wiki has a so-so breakdown, though as anyone can edit, I expect a revising battle is on-going. A clear example is one instance of Blinken being "shown evidence" of a lot of heinous shit except when going to the article, it's just a recounting (doesn't say he witnessed the evidence plus other details added not in the article). Another one is the rapes, saying first responders have witnessed multiple signs of it but no coroner reports have been provided.
No Israeli family victim owes skeptics anything and I am 100% willing to take first responders' words on this but let's not turn a blind eye to the fact that Israeli government just outright lies and would be willing to put up "witnesses" on camera to push narratives.
https://en.wikipedia.org/wiki/2023_Hamas_attack_on_Israel
https://www.ynetnews.com/article/sk00hx4s7p
Referring to a video made by the IDF Spokesperson's Unit about the horrific events of October 7, which compiles footage of violent acts committed by Hamas terrorists against Israeli civilians, Khatib-Yassin told the Knesset Channel in an Interview, "they didn't slaughter babies, at least from what we saw in the footage, and they didn't rape women." However, she added, "if this happened, it is shameful."
She learned about its contents through firsthand sources, three party members who had viewed the film. "We sat down on Saturday and discussed what was in the video. I avoid watching such clips because they only cause more pain."