I agree with all of this, in theory. In practice, a lot of the success of America was driven by a strong culture of shared Christian values and a free and capitalist economy. We are losing both of those, and that is a huge problem for our country.
Democracy and our founding principles are amazing tools in a world with some level of baseline social cohesion. They do not work in every situation.
It seems like we agree on way more than we disagree. If you acknowledge that immigration currently is an issue, then we are on the same page.
We can dream of a vetting process based on values, ran by great people who want the best for us, but while we dream about that we will become a minority in our own homelands.
The “overreaction” is our culture and races immune system. It’s not always justified, but it certainly is something to be thoughtful about.