Those people should try to live in other parts of the world first. We have it good. So good. There are a handful of countries that are pretty decent but they lack economic opportunity, diversity, etc. You can't have everything.
You can't have everything. No country is perfect but America is better off than most countries if we account for all the factors. Coming from a country with no political freedom, I am proud to be an American. There are a few youtubers who hated the US whwn they were young and went to live abroad for a decade only to come back to the US enlightened. I take it most of these polls are people that never lived abroad.
Does that mean we stop trying to improve it for ourselves and others? A raising tide lifts all ships. We tried the trickle down version for decades, maybe we try a different way.