Similarly, dismissing the concerns as "short sighted" is just ignorant of history. Plato was thinking about the challenges of reconciling immigration with democracy 2,000 years ago. Alexander Hamilton presaged the destabilizing effects of immigration on democracy at the inception of the U.S. https://www.iwp.edu/articles/2016/12/21/hamiltons-actual-vie...
Indeed, that is a problem. The fraction of such folks is rather small though, if you take an honest look at the statistics. It's quite rare to actually see this, apart from videos at politically leaning talk shows or youtube or a rally of certain folks. At least in a menacing way -- nobody takes issue with a Swede waving their flag on midsummers eve or some 6th generation irish folks getting drunk on st patricks day eh?
It needs adressing nevertheless, I'm with you there. Helping immigrants to integrate better rather than just dumping them into ghettos would be an idea. But it's rather unpopular especially in affluent neighborhoods to let little blond caucasian princess share school with the dark skinned kid whose parents have a strong accent and don't celebrate christmas. Integration sure, but not at the expense of my precious darling!!!1