Is this a conjecture or a claim? In my experience the Overton Window is wider in the US than most other places, but there is also a greater tendency towards trolling in US society as well. These assertions would be challenging to measure, but might be amenable to proxy representations.
It's just my own observation. It's definitely wider in the US than other places but also enforced differently, depending on where you go. In the US, we have a "soft" enforcement, although with doxxing, etc., it's not so soft in many cases.
