Why did western politicians decide on mass immigration even though the common man hated it? Why did they sell the white man out like that?

There isn't enough land to go around and production of food has become harder so both have become unaffordably expensive. the 100s of billions of Dollars we have been flushing into the third world's shitholes wasn't enough so our elite has decided that the average white mans prosperity and interests should be sacrificed for unvetted and ungrateful mass immigration and then presto we are all multicultural nations celebrating becoming a minority in our own countries. I just don't get it.
Why did western politicians decide on mass immigration even though the common man hated it? Why did they sell the white man out like that?
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