There are lots of things about the US I would change (socialized healthcare being the obvious thing in my mind), but I don't think that we should delude ourselves by saying that the US is beyond redeemable.
I will agree that the acceptance of conspiratorial thinking in conservative circles is especially harmful (I wrote more detail about that in a sister thread), but you don't have to look very far in European history to find them electing demagogues too.
I know it's commonplace to wail on the USA because of all the shite that seems to be getting shittier but there is _so much_ goodness in the USA.
The systems are a bit broken. The constitution needs modernization, access to and application of the laws need to be made measuably fair, and the economic model requires reformulation. Racism, sexism, and perverse idolatry need to be educated out of the standard models of discourse. But.
The USA is still a paradigm of democratic republicanism. It's still full of amazing humans, many of whom work hard to improve other people's lives. It is seething with debate, invests hugely in technology, and still reacts quickly to changes of circumstances. It's fucked, but not irredeemably so.
Mainly it needs to focus on education and healthcare, especially by removing pernicious, profit-seeking, short-term motivations.
Also, stop voting Retardicans.
To be fair, Demoticrats are a pretty shoddy bunch of disorganised and intellectually confused herd of kittens, but they at least _try_ to improve the lot of other humans. The Retardicans are big business first and all else after, with a whole heap of contempt for thought on the side.