I think Israel has a right to defense qua state and Palestinians have a right to resist qua subjects of unjust rule. These aren’t really contradictory positions, and both are pretty standard from a “this is what the UN says” ground truth[1][2].
(This is distinct from a state’s “right to exist,” which is nonsense. But once a state does exist, it has the right to defend itself by definition.)
[1]: https://www.un.org/en/about-us/un-charter/chapter-7
[2]: https://en.wikisource.org/wiki/United_Nations_General_Assemb...
If they both have a right to kill each other, does the other really have a right to defense? Making it complicated introduces legalistic flaws and distracts everyone from actually fixing it by doing something simple, like tying sanctions to murders of civillians.