Nobody
needs to have sex more than a few times in their lives. You wanna limit the sex lives as well?
Basically, your morality is all wrong. The point of life (for humans, at least) isn't to do what we need - that's only the lowest, most basic level of Maslow's pyramid. It's self-actualization, which essentially means fulfilling autonomously chosen goals. You might see no reason to drive 200km/h, but others might - why limit them? The only potential reason is safety, but hey, people enjoy plenty of extreme(-ly dangerous) sports, so clearly there are reasons to trade off safety as well.
In addition, an appeal to safety doesn't actually make sense in this instance - why would 120km/h be better than 200km/h? I mean, it's slightly safer but still incredibly unsafe! If we prioritized safety over all else, we'd all be driving at most 30km/h! So clearly "safety" isn't a good, objective reason - at best, it's a subjective, arbitrary threshold, but then we ought to recognize that diifferent people will make different tradeoffs regarding safety.