Palestine nationals did try to work towards a deal. Zionists did kick Arabs out of their homes, 80% of them in what shortly became Israel. Oh, but they're not genocidal, they just want to kick the Arabs off their land and make them not exist as a collective people there. Why couldn't I see that? Those pesky Palestinians need only accept being a minority in a Jewish theocracy, then they don't have to leave their homes.

Jordan was not unilaterally turned into the kingdom of Jordan by the British, a Transjordan independence movement wanted to prevent immigration of Jews to Mandatory Palestine, but barely managed to unite the land in present day Jordan. Jordan wasn't a fully independent nation at this time and Mandatory Palestine certainly wasn't. They didn't have a choice, and the king would have tried to unite Palestine with Jordan if the British didn't have plans for it.

You seem to think that a common people with a shared culture will automatically unite as a nation, but organizing a state isn't easy. Independent tribes need to be convinced of the usefulness of a larger collective in order to form a state. They give up autonomy in creating a nation, so the tradeoff must seem worthwhile. If not for the external threat of Europeans trying to carve up and control peoples in the Middle East for selfish interests, they would prefer to be tribal and borderless. This isn't because they're uncivilized or savages, but because regional autonomy is a cool vibe. It's not true anarchy, but it's a less centralized mode than what Europeans thought was normal and civilized.

This is why European empires carving up the Middle East and demanding they form nations is so fucked up. They made arbitrary borders, often intentionally drawn to perpetuate and create conflict, because they think centralized governments are just the norm. Centralized governments can be useful, but they're not without drawbacks and aren't always superior. They need to come about naturally out of shared interests and the desire to accomplish what can't be done singularly. This is why the UK leaving the EU was so ironic and hypocritical: they wanted to be more than equal partners because they're so used to dominating imperially. When you're used privilege, equality feels like oppression.

Anyhow, your understanding is shallow and ignorant. I'm not in the mood to give you a college course in social science and history that you might not even listen to. The best I can do is advise you to ensure your arguments are supported by evidence. Try to use evidence to inform your opinion and not to cherrypick facts that support your preconceived worldview. It's a struggle to do this and not as easy or convenient, but it is what people should try to do.