Democrat mayors are complaining now but in the long run the Democrats benefit from the unlimited flow of future Democrat voters (10 million and counting—plus their children and grandchildren will probably be loyal ‘Rat voters). This is their key to turning Texas and a couple of other states reliably Democrat in future elections.
The Democrats will not benefit in the long run, and neither will the leftist parties in Europe who are doing the same thing.
The reason? The United States and Western Europe won’t even be there. Europe will be Islamic and the United States, well, who knows?