Stand at an intersection and count how many times light turning red does not have a car sneak right after. Or stop with half the car over the stop line. Or motorcycles being in front, in the bike-only area. Or drivers who treat bike lanes as "oh I'll just stop here 10 minutes, who cares?".
My experience with cycling in cities is that you quickly discover that basically nobody obeys any traffic rules. Cyclists are just the ones doing it the most blatantly, because honestly when they do it it's not actually that unsafe.