From memory, Chomsky says Israel is used by the west as an important bulwark against the Arabs, earlier secular nationalism, today more conservative and radical variants of islamism. He also says some of the early state actors were Christian Zionists, who thought highly of Jews returning to their supposedly religious lands. I could also rope in a line of argument I liked in an Ilan Pappe lecture, about settler colonial societies being able to recognise one another and happy to reinforce the same logic of domination.
That all said, my problem still is, even by the UK's own selfish merits, support for Israel is a terrible idea. It increases the likelihood of Arab states working against the west. It increases the likelihood of a backlash by the global south against the west. It undermines the moral position and the longevity of supporting Ukraine in its conflict. Strengthens the hand of Russia and other bad actors. It increases the likelihood of global terrorism. It commits Israel/Palestine to potentially further cycles of violence. And definitely will not make Jews, globally, any safer.