Just like any culture there are many parts of the American one, but the part that comes from adventure, exploration, freedom etc definitely has been on the decline since about the 70-80s. Control and Puritanism is what’s stronger now.
Personally I hope it swings back at some point.
If all adults agree to build mechanized genocidal murder factories that will remain a stain on humanity for centuries it is still wrong to do so.
Some rights are non-negotiable to my eyes. Even (or maybe especially) when a democratic majority decides to break them. Legality doesn't matter here. The concentration camps next to where I grew up were also legal during Nazi reign. That doesn't make them right, not back then, not now and not in the future.
I'd highly advise against a petty "let's se where that gets them"-stance when it comes to human rights issues, because those paying the price are not those who commit the atrocities.