I don't think we should be regulating things from a place of "I can't imagine ever needing X; we should mandate technological controls to prevent it." We should regulate things as a need arises, based on data
The “need arises” part are the thousands of people killed and orders of magnitude more with serious injuries who will never have the same quality of life as they had before the collision. In the case of cars an absolute cap at, say, 85mph would cover the maximum speed legal speed for the entire United States and still be at least 40mph lower than the top speed of almost all vehicles sold here.
It's not about not being able to imagine the need or not. It's from seeing people driving their cars at highly dangerous speeds all the time (easily 20mph faster than most people who are already driving 10-15mph over the limit). If it were only dangerous to the driver, it'd be one thing but they put others in danger. There are countless stories of speeding drivers killing bystanders.
