There's a reason why speed limits are where they are.
On a race track your aim is to be as close to the grip limit as you can for as much of the time as possible with only a very small margin for error - hence why they only have traffic going in one direction and have run off areas, ambulances on standby etc etc
On a public road the aim is to be driving your car with a VARY LARGE margin for error (i.e. miles within the grip limit) so that WHEN the unexpected happens you can react in time to safely recover from the situation without any unecessary loss of life or injury to yourself or others. See the difference
Going around a corner at twice the posted limit doesn't prove your a great driver, any numpty can do that. And anyone that drives at twice the speed limit on a road they don't know should have their license torn up into tiny little pieces and never be given another one.
The whole argument about people dying because of unsafe roads is a joke, the vast majority of fatal accidents are preventable by the driver at fault.
I'd suggest that alot of people need to learn about the term "risk assesment" it will stand you in good stead in many areas in life not just on the road. Taking unnecessary risks is just stupid plain and simple, taking an risk based on sound knowledge of a circumstance that has a high probability of a positive outcome is wise.