If you're asking me for a long thread about why British, French, and Russian colonialism in MENA was good, sorry, I don't have that for you. But somehow, it only ever seems to be Israel we're talking about when we discuss this stuff. Israel is no less legitimate than its neighbors, some of which have in the last 5-10 years laid a much stronger claim to the word "genocide" as well.
I would suggest maybe you not lead with Sykes-Picot next time you try to formulate this argument.