A car is after all a machine and anyone can work up the speed by pressing the acccelerator but a sensible person is one who is able to control that speed!
Fast driving differs from rash driving. You cannot drive very slowly. The speed should be one your are comfortable with. always maintain some distance from vehicle going ahead and behind you. Drive slow while turning and near crossing. Follow traffic rules including speed limit.
I find some youngsters' conduct on the road with their bikes to be most reprehensible.Their reckless driving not only invites threat to their own lives but also that of other users of the road!
I think it depends upon the experience and capability of a driver and I think anyone should drive fast to the extent he or she could control the vehicle and have total command over them...