As someone who both walks and bikes a lot (currently in NYC): Bikes often run lights when they shouldn't, and that's dangerous and shitty. But even more often than that, pedestrians stride out into the intersection against the light in front of a bike that's riding through with a green light. Pedestrians stop for cars, but many don't think bikes are worth stopping for no matter what. The problem is on all ends (and as I said in my other post, systemic)

Everyone, no matter their means of transit, should try to prevent collisions. You're endangering yourself and others if you don't.