Are bad drivers really a serious threat? Is it really something worth worrying about? Is it a problem that needs solving? Directly?
Whether I'm walking, driving my car, or riding my bike, I do so defensively. I feel my behavior provides reasonable protection from mistakes of bad drivers. Sure, I'm still vulnerable to the most blatant and wild errors -- a drunk driver driving up onto the sidewalk, or coming across the road into my oncoming lane -- but the likelihood of my encountering such bad driving is so slim, the only reasonable assumption is to assume it won't happen.
So red light runners, speeders, lane drifters, stop rollers, reckless drivers, etc., I say, yawn.