haven't seen the video(I'm listening to music so can't watch it now), but I think smoking/having a bong in public isn't necessarily stupid/inapropriate. in my younger years(1-3 years ago) I have smoked bongs in public, and got away with it.
one of the most memorable was on a festival, but ofcourse festivals are different. this was a festival on a square in the citycenter, and there I met a guy who had broughtr a bong with him, so we formed a circle with some more people.
but there was also a time where one of my friends had just bought a bong, so we wanted to try it out. wich we did while sitting on a bench in the park.
and another time when a friend had his bong with him(a mini-bong) and we smoked bowl after bowl trough it somewhere next to a canal.
however from your comments I get the clip is more about just provocating with a prank. in that case it could indeed hurt legalisation efforts. but it could go the other way too, I once read that the decriminalisation in my own country(the netherlands) was partly caused by the actions of provo's(apparently they had a point-based game where you got points if you got arrested)(I don't know much about it because it's before my time), so I'm not really against such actions.
semirelated, whenever I hear of something related to policeprovocation it makes me think back to this clip:
the guitarguy in that clip is someone I kind of know(went to the same highschool, saw him dancing on the tables in the canteen a few times).
it's in dutch, so I'll translate some phrases:
when he is walking up to the cops, he says 'this is going to be fun'
he starts off with 'I want to turn in myself for a horrible murder', then when the police object against the camera being on them, he says they're corrupt while he walks away. the cop says 'have you ever had a kick under your ass?'(multiple times, kont=ass, schop=kick), and to shut up, after that the insult that made the cop punch him was that he called the cop a 'monkey in a uniform'