You could argue that since signs and lights are for traffic control and there was no traffic, the signs were irrelevant. OTOH, you could say that you as a road user, were in fact traffic to be controlled.
Sitting at long red lights with no other vehicles in sight, you start thinking about how you can make judgements about your own behavior affecting safe road use and that leads to the thought that you are smarter than the traffic control device. The bottom line is that by blowing the light or stop sign you did not contradict the intent of the control (which was to prevent collisions). Your sin was that you got caught and reinforced to those present that you (and all other cyclists) are scofflaws.