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.
Be idealist all you want. If you try to convince someone to join or support your cause by angering them, it won’t work. You form enemies, not allies.
If the purpose of this was to make the bikers feel good while turning people against bikers, I’m sure it worked. This protest isn’t going to make someone in a car 30 minutes late and think “hey those cyclists just going through red lights, the wrong way, making me late, they got a real good point.”
People need to be realistic and realize that whimsical ideals don’t seamlessly translate to reality.