Cars do come to a complete stop every time they reach a stop sign or red light. Those that don't tend to get very expensive tickets. Pedestrians also stop at intersections, usually, and those that don't tend to get tickets.

It's just cyclists who seem to think that they're above the law. Guess what? They chose an inefficient form of locomotion, then they get to live with the consequences of that--including stopping at intersections like the rest of us.