In most states a bicycle is considered a vehicle, meaning you must ride in the same lane and going in the same direction as cars, signal your turns and obey stop lights and signs. When I see someone ride a bike against traffic or on a sidewalk, running a stop sign, etc., I have two nearly simultaneous thoughts: (1) he should get a ticket; (2) he's probably going to get hit by a car. It seems to me either result is undesirable from a survival standpoint.
All we can do is all we can do.