As the looks of it, US is pretty non-free when it comes to peacefully protesting. So I guess this feature is very timely and directed towards users there ;)
It's most certainly not just the US. In the (western European) country where I live, for instance, even a static protest or demonstration with no chanting or marching and only a few participants requires non-trivial and somewhat expensive police approval ahead of time. Most larger spontaneous events seem to just ignore this and the police haven't generally responded violently, to their credit.