Can't disagree with the emboldened bit, but until such time as active measure can be put in place to prevent bad driving, speeding tickets is the only way to clobber speedists (which some might say is still 'bad driving').
I'll add in shit parking while I'm at it.
Actively driving slower (as opposed to being a natural slow-coach) requires care, attention, concentration and good judgement. Similarly, a speed camera generally brings the driver back to the land of those necessities - even if only for a minute or so.
Those that don't wake up at that moment...