If by “we” you mean America then I would say that America gets an ally right in the heart of the Arab world, which is frequently opposed to American ideologies. The strategic location is enough to justify the American government’s investment in Israel because it facilitates the US foreign policy, for better or for worse.
I’m not defending their’s or Israel’s actions. I’d just like to remind everyone that the whole region is tense and complex. It has always been. Oversimplification of the issues leads to even more conflict, in my opinion.