[quote=@Buddha]
[@Vilageidiotx] Even neo-nazi groups aren't enough to warrant this all because the same principles I just proposed in the OP also apply to neonazi groups. Repression = faster and heavier radicalization. It's a timebomb.

Ban on masks has already been imposed in Europe. Specifically motorcycle helmets and balaclavas. Wearing them anywhere other than on a motorcycle will get you arrested. Not hard to hold up, and it's not arbitrary since they are 2 well defined clothing articles. So far it has worked. Somewhat.

And since protests typically need permits (here in the Netherlands, unsure about US, can't imagine it's different there though) it'd be pretty easy to just have oversight, and pick out those people wearing clothing that is too concealing. I suppose a warning could be given first, but really, they'd just re-enter the crowd and put it back on.

I remember the G20 in Toronto had heavy problems with this type of shit, where people would conceal themselves, break down Starbucks and other 'capitalist' symbols, and then disperse and undress and rejoin the regular protesters. It was hard to deal with.
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They do, though protest permits are about as controversial as gun permits. The idea you might have to purchase your rights rankles people.