This was a Critical Mass event, which is why the bicyclists are taking up all of the street as a way to reclaim the streets and protest the lack of safety for riders under usual conditions. It’s not legal, but protests are never useful if they’re fully legal now, are they.
I think you’re a little too focused on the one very specific way the bicycles were being unsafe in the video. Every example they listed was another way that cars are driven irresponsibly all the time, not just during a critical mass event where the point is to flood the streets with bicycles.
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