The IDF has killed or injured family members of many of the Palestinians (we all know in the Muslim world they love marrying cousins so there’s tons of inbreeding). These recent airstrikes have also displaced over 200k people: that’s over 10% of the population of Gaza losing housing overnight not to mention all their meager possessions. Many of these people are poor and I wouldn’t be surprised if Israel just destroyed whatever small middle class Gaza had by destroying the inventory and storefronts of small business owners.
They’ve created a powder keg of pissed off people with nothing to lose and they’re going to bring in an occupying army that the Palestinians can shoot, throw rocks at, or suicide bomb. The reason Israel doesn’t have huge amounts of casualties in previous operations has been because of their complete air superiority and dropping bombs rather than sending large amounts of troops. Hundreds of thousands of poorly trained conscripts going into a massively populated urban area with pissed off locals will be a bloodbath: especially for the Palestinians.