On Oct 7th numerous instances of 'Hannibal Directive' have been made evident. The most extensive casualties are due to 28 attack helicopters ("Apache") emptying their full complement of weapons ("shoot everything") and re-arming through the course of the morning hours of that day. Other known incidents have been reported of tanks firing on homes known to have hostages inside under orders from command. There are also reports of drone operators firing at vehicles and other targets that likely had hostages contained within. This list of links focuses mostly on the evidence of the helicopter attacks.

What is the Hannibal Directive?

"the name of a controversial procedure that was used by Israeli Defense Forces (IDF) until 2016 to prevent the capture of Israeli soldiers by enemy forces. According to one version, it says that "the kidnapping must be stopped by all means, even at the price of striking and harming our own forces."[2] It was introduced in 1986, after a number of abductions of IDF soldiers in Lebanon and subsequent controversial prisoner exchanges. The full text of the directive was never published, and until 2003, Israeli military censorship forbade any discussion of the subject in the press."  

TL;DR: A policy of killing hostages instead of allowing them to be taken alive.
https://en.wikipedia.org/wiki/Hannibal_Directive

Israel Killed Hostages on October 7th, Al Jazeera Doc Shows
Novara Media coverage of new Al Jazeera Doc about civilian casualties by Israeli forces including clips and commentary runtime: 24:08
https://www.youtube.com/watch?v=mArZ60k9EEo

"How Israel Merked its Own Civilians on October 7"
This video essay does a really good job of tying together the various bits of information collected in this post into a concise narrative. runtime: 12:35
https://www.youtube.com/watch?v=fCjTki-OgKQ

Israeli army ordered mass Hannibal Directive on 7 Oct: Media
An investigation from Israel's leading newspaper indicates Israel deliberately killed many of its own civilians and soldiers during Hamas' Operation Al-Aqsa Flood to prevent them being taken captive back to Gaza
https://new.thecradle.co/articles-id/18512

Shielding US Public From Israeli Reports of Friendly Fire on October 7
Since October, the Israeli press has uncovered damning evidence showing that an untold number of the Israeli victims during the October 7 Hamas attack were in fact killed by the IDF response. https://fair.org/home/shielding-us-public-from-israeli-reports-of-friendly-fire-on-october-7/

Israeli HQ ordered troops to shoot Israeli captives on 7 October
pretty solid overview of Helicopter, Drone and Tank attacks on hostages
https://electronicintifada.net/blogs/asa-winstanley/israeli-hq-ordered-troops-shoot-israeli-captives-7-october

How Israeli forces trapped and killed ravers at the Nova Festival
New evidence points to Israeli security forces, not Hamas, for causing the most fatalities at the music festival - civilian deaths that were then utilized to justify Tel Aviv's Gaza genocide.
https://new.thecradle.co/articles/how-israeli-forces-trapped-and-killed-ravers-at-the-nova-festival

AP News video
Israeli rave survivors return to look for cars after Oct. 7 Hamas attack
Hundreds of scorched and destroyed cars have been moved from the Nova music festival after the Oct. 7 Hamas attack. Almost a month later, some survivors return to look for their vehicles to reflect and make sense of what happened.
This shows the scale of the helicopter attacks, as HAMAS had no capabilities to do this type of damage.
https://apnews.com/video/israel-hamas-war-israel-hamas-war-and-unrest-assault-1c3a2dd42dbb4f58a1ce29c431d080da

Daily Mail - official youtube channel (CW: Deaths)
Israel Apache helicopters strike Hamas targets with chain gun and missiles
posted Oct 16, 2023 #dailymail #israel #hamasattack
Here is direct video evidence of helicopter attacks on civilian vehicles, pedestrians, etc with no clear discrimination of targets.
https://www.youtube.com/watch?v=GkNYB0DayKo

We Blew Up Israeli Houses on Oct. 7, Says Israeli Colonel
AN AIR FORCE COLONEL has said that Israeli airstrikes may have intentionally killed Israeli captives rather than let them be taken to Gaza. Speaking in Hebrew about the airstrikes, Colonel Nof Erez told a Haaretz podcast in November, that “the Hannibal Directive was apparently applied” and that Oct. 7 “was a mass Hannibal.” An extensive article collecting details of helicopter, drone and tank attacks on hostages that day.
https://www.wrmea.org/israel-palestine/we-blew-up-israeli-houses-on-oct.-7-says-israeli-colonel.html

The Electronic Intifada youtube channel and blog
"Mass Hannibal" — We killed Israelis on 7 October, says Israeli air force colonel
An air force colonel has said that Israeli airstrikes may have intentionally killed Israeli captives rather than let them be taken to Gaza. Speaking in Hebrew about the airstrikes, Colonel Nof Erez told a Haaretz podcast in November, that “the Hannibal Directive was apparently applied” and that 7 October “was a mass Hannibal.”
The colonel confirms that the helicopters killed hostages and civilians indiscriminately during the chaos of that day.
https://www.youtube.com/watch?v=r63nmfbIUBA https://electronicintifada.net/blogs/asa-winstanley/we-blew-israeli-houses-7-october-says-israeli-colonel

Friendly fire may have killed their relatives on Oct. 7. These Israeli families want answers now
Relatives of civilians killed at a kibbutz in southern Israel during the Oct. 7 attack by Hamas are demanding the military immediately investigate signs that some may have been killed by Israeli security forces as they battled militants holding hostages AP article that covers the incidents of tank attacks on homes with hostages inside being investigated.
https://apnews.com/article/israel-hamas-hostages-investigation-friendly-fire-3b6fdd4592957340b32a8ee71505b8e9