Not going to dispute that what happened on October 7th was horrific, but lets not water down the holocaust. This as horrible as it was, was more like an old medieval era raid but worse with the level of hatred that was had for the people it was against. The holocaust was a combination of slavery and forced human experimentation and all kinds of other horrible things that also happened on October 7th all culminating with the plan of extermination. Which yes that may be what Hamas says their goal is but that obviously wasn't the goal of the attack, it was to perpetuate the cycle of violence and gain hostages for leverage. If anything they were too successful, they were like a dog chasing a car and they accidentally caught it, now they're hanging on to the bumper as the car speeds down the highway at 80 mph.
If I had to guess the reason why, it's that right now the U.S. is pretty useful pushing for the negotiations for the hostages and the ceasefire, so they want to keep us engaged in that which becomes less likely if our hostages are released.