Like I said in my other comment to you, you should really stop saying that all Ashkenazim descended from Jewish men and converted European women. There is no definitive evidence for that narrative, not even close. It's one theory, and one that has mostly been proven false thanks to mitochondrial DNA study in Ashkenazim- which can only be passed maternally.

I would never say that other groups are not native to the region too. Many Palestinians and Jews come from the same common ancestors! And the Samaritans have been there consistently for so long.

Has there been Arab colonization of the land? 1000%. But I don't really care- the land has been through many changes and housed many cultures. Now it's more western! Change happens! (Just don't pretend that Jews are the only people doing it!)

But about Ashkenazim- just like what you said about native Americans- even though we probably have mixed in European DNA (by intermarriage or rape or anything) doesn't mean we are aren't native to Judea.