Cars are dangerous at any speed. Sadly a car can still kill a pedestrian even if it driver is obeying the speed limit, thus road safety is the responsibility of not just car drivers but pedestrians as well.
Whilst I wholeheartedly support speed limits in built up areas, especially around schools and playgrounds, I think that there too many speed limited areas. The over use of limits means the importance of speed restriction in particular areas, such as schools, often lost.
Too many of the limits are unrealistic, especially in rural areas and impossible to adequately enforce anyway. Often you are endangering nobody but yourself by breaking the speed limit. Nevertheless, these areas are occasionally used by the LE for the purposes of revenue collection, as their speed trap serves no other point. Sadly these types of antics cause many to lose respect for the Police.
For some, including me, speed is a drug. Now anybody can put their foot to the floor and drive fast on the 401, it is basically a straight line. The thrill for me is negotiating a series of bends as quickly as possible.
A speeding driver is probably concentrating harder and therefore less likely to endanger life than a driver who is obeying the speed limit but also, drinking a coffee, using a cell phone, smoking a cigarette, doing a crossword or putting on their mascara.