nor goomba stomping the disabled via parachute is expressively illegal in any law system I know
This is called assault and battery, so it doesn't need its own law. If you're specifically targeting someone for being disabled, there's a good chance it's a hate crime, too. I don't understand what makes this a good example.
Also, as others patiently tried to explain, the number of person-hours spent driving versus skiing and skydiving are wildly different, and that's probably the more important part. At best, you're making an argument that skiing should have speed limits (probably by rating or something since putting the same speed limit on a bunny slope as an expert slope that is practically dumping you straight down would be silly).