"Wearing all black at night and masking up too is a criminal offence in large parts of the world for obvious reasons, and I don't mean at political protests."
Depends on where you live, but I would think just dressing in black wouldn't in itself be a crime. After all, it could be Halloween or you could be an actor. Unless you can cite the law?
As for being seen, they just need to nip off around a corner somewhere with lots of egress points. Any good prankster (or burglar) is sure to have carefully planned out the escape routes, particularly in regards to getting out from Big Brother's eye (and unless you're a place like China, there WILL be blind spots to prevent privacy suits). Trying to cover ALL of them's going to result in asymettric warfare. Plus there's always impersonation. SWAT a car AND pin the blame onto someone else.
"A lot of CCTV systems have specific alarm settings for dazzlers or something masking the camera, so doing either will likely get you noticed even faster than if you just wore a mask. (hint: if you try walking into a bank with a dazzler active, you can expect the shutters to come down almost instantly)"
You're inviting a Cry Wolf incident, then, by launching such a device from out of sight.