(What do you refer to with "this"?)
America isnt really a democracy it's a plutocracy.
https://www.nbcnews.com/nbc-out/out-news/swiss-lgbtq-groups-...
"Popper posited that if intolerant ideologies are allowed unchecked expression, they could exploit open society values to erode or destroy tolerance itself through authoritarian or oppressive practices."
That's not a paradox of tolerance, it is the anti-democratic practice of fascism.
> they could exploit open society values to erode or destroy tolerance itself through authoritarian or oppressive practices.
This is exactly my point: an emerging fascist government through authoritarian or oppressive practices destroys tolerance by silencing people for any words that go against their agenda. There is no paradox here.