What if I told you that evidence has shown that immigration was deflationary and contributed to the low inflation that the US experienced where other nations had it far worse than we did?
Immigration at it's current levels might be great but not necessarily if it greatly increased. What you have to demonstrate is that in a world full of climate change caused chaos allowing tens of millions of people into the country is it a bad idea. We don't live in that word yet so referencing the effect of current levels of immigration is not relevant.