Agreeing with the other sibling comments. I think in part it was following the same vision that the current Israeli government had been following already before Oct. 7 - they had annexation of the West Bank listed as one of the official goals of their coalition since they were elected.
Another part stemmed from the extreme dehumanization of Palestinians that was already established in Israeli society long before (and to a lesser extent also in other western countries). The overton window had already been shifted so far that this kind of response was seen as mostly normal.
I found the standard justifications of "eh, war is always cruel" and "when their kids grow up, they will just become the next generation of terrorists" pretty telling.
Another part stemmed from the extreme dehumanization of Palestinians that was already established in Israeli society long before (and to a lesser extent also in other western countries). The overton window had already been shifted so far that this kind of response was seen as mostly normal.
I found the standard justifications of "eh, war is always cruel" and "when their kids grow up, they will just become the next generation of terrorists" pretty telling.