IF (and If is carrying a lot of weight in this statement) there is a genocide going on, then the victims should fight back by whatever means possible. This applies to any genocide - Jews in WW2, Rwanda etc,
And "if" there is only occupation, progressive annexation, pogroms, apartheid (in the occupied territories), destruction of houses and villages, of crops, periodic bombardments with thousands of civilian deaths, total blockade- and this goes on for decades with absolutely no recourse to justice (as we see, Western governments have troubles condemning Israel even for the total destruction of Gaza)? Then how do you think the victims should be allowed to fight back? How would you fight back if that were happening to you?
We could argue about who started (certainly it didn't start on October 7, if that's what you mean), but that's beside the point, I think. We can assume the the cycle of violence has been going on forever, with no clear initiator (or with an initiator on the losing side, for what matters).
Would you be relieved to know that they're taking your home and killing your innocent family because someone on your side did something bad before? Or would the sense of injustice push you to more violence against the other side? And how would you deal with the knowledge that the other side is actually gaining ground at each further round of violence, unilaterally deciding what's fair for them to take, and that even if you can swallow your pride and stay put, someone else from your side eventually break and provide more reasons for the next persecution?