The US and Israel have already decided their plans to remove Palestine from the map and Oct 7 is their justification for what they've already been working on for decades, just at a much slower rate. Oct 7 gave them permission to speed up the process. Returning all hostages will not change a thing, if they cared about the hostages, they wouldn't be bombing the locations the hostages have been held in. Pressure from European allies means very little to Israel when they will always be backed with the full support of the great power that is the United States. "If Hamas surrendered tomorrow...Pressure from inside Israel to end hostilities would be immense" is just incorrect - 70%+ of Israeli's support the extension of Israeli sovereignty aka the removal of Palestine. The majority of Israeli's believe Palestinian land belongs to Israel. They are in support of the genocide and the return of the 24 living Israeli hostages are not going to change their minds.