The American birth rate is less than what is needed to maintain our population. We need some people, why not some of the best in the world? If your population is not growing your country is dying.
And why is that? We can either fix our country so that our own people once again have the confidence in the future to start families, have the money to buy homes and raise kids.
Or, we can import another 50 million people from utterly alien cultures and see whatever we used to think of as "America" be utterly swamped and diminished. We can live as a barely tolerated minority in a country run by Indians and Chinese, and sure, maybe we can have a good GDP.
I think that's a fools choice. It's the choice of the (to my mind) discredited CivNats and cuckservatives. I choose to not support that future.
Obviously, you and many others on the right disagree, and hold fast to the ideas of the "proposition nation". All I can do is shake my head in sadness at that.