Earlier quoted context omitted.
> nationality I mention it specifically because, in all the nationalities i have talked to, i.e. in my personal experience, the USA is the only one to have a high school debate club culture that's widely spread.
At a minimum, I personally know of active school/university debate societies in the United Kingdom and Australia. And while it sounds like you've had some bad experiences, my personal sense is that the majority of people with formal debate experience are actually better, on average, at staying within the bounds of civil discourse. Having said that, there is indeed an overly aggressive subset of the population that is…
I'm also curious what exactly you mean with civil discourse? I don't know which style you're referring to, but i've seen people who cared primarily about discourse being "polite", even if the most horrible ideas were being presented as valid.