I am not arguing for people to drive FASTER than the speed limit at all. I am arguing that people should drive for the conditions of the road. Sometimes this will be considerably SLOWER than the speed limit. My point is that many people equate sticking to the speed limit as safe, but it is really not that simple. I don't want you hitting my child whilst driving at the speed limit, I want you to be alert enough to see a small child at the side of the road, realise there is a possibility he might step out and not hit him at all. Not running into people gives much fewer fatalities than hitting people slowly.
I have also NEVER thought "that doesn't apply to me because I am a truly FAB driver". I have on occassion (when driving late at night on an empty motorway) driven over the speed limit slightly (i.e. 80 or so), because conditions were such that it was not dangerous to do so. On the other hand, I will crawl around residential areas because of the risk of children playing on the road etc, whereas some people will still screech down those streets at 30 mph.
Also those doing 90 in torrential rain and poor visibility are not driving to the conditions of the road either. However, in those conditions, otoh, if they were driving at 70 (assuming it is a motorway), they probably still are not driving safely. Especially not if they are hugging the bumper of the car in front.
That is exactly my point, it is not that I want someone to drive 90 in torrential rain, but I also don't want them to drive 70 in those conditions and far too close to me. However, the speed cameras will not pick that they are driving incredibly dangerously and should be driving maybe 40 or so with at least double the normal braking distance. This is a problem which can only be addressed by better driver training in the first place though.