I appreciate the measured response. But I'm not going to credit YouTube videos. I'm happy to read peer-reviewed science or even professional press articles or history books about those issues. Read and share the Imperial College study if you like.
Here's one (https://pubmed.ncbi.nlm.nih.gov/23052947/.) that indicates a strong genetic relationship, as well others I found showing genetic overlaps between Jews and Palestinians. Yet other studies (some that you may dispute) show the Philistines came from elsewhere in the Mediterranean and Arab populations migrated in. It's never all one monolithic thing, but the body of evidence leans in one direction.
And to help understand why Jews may contain so much EU blood, someone close to me apparently has both middle-eastern DNA, Sephardic, European, and even some Genghis Khan mixed in. It seems very likely there was both voluntary and involuntary (aka rape) interbreeding over several thousand years. That may be one reason why Jews consider you genetically Jewish if your mother is Jewish, but the father doesn't matter. It also seems true that darker-skinned Jews didn't fare as well in racist Europe, leading to a survivorship bias.
As for the British, yes they were imperialistic brutes and left generational trauma wherever they went. But if you dispute their resolution of the borders here, then you must also dispute every other country they occupied that is now independent. Also, I don't think they spearheaded importing anyone. Jews fled Europe of their own accord, when conditions permitted. For example the USSR had windows where they were open to Jews leaving.
The UN was the only body available at the time to ratify the partition plan. If people claim that's illegitimate, then they should also stop citing their modern resolutions against Israel to be consistent. Personally, I think it's fair to consider those all as valid (though not fully agreed to).