You know what seems like a good idea? Establishing a life-long, committed relationship with the person you love. And a bad idea? Willfully plummeting 10,000 feet, with only a thin chord between you and death. But, hey, it's your choice. Well, you have the choice to do the second thing. The first thing, not so much.
In the United States, skydiving, base jumping and parasailing all fall under the umbrella of 'personal liberty.' There are hardly any regulations on these activities, even though they account for hundreds of deaths every year. Sure, there are rules that the United States Parachute Association has published. They've even gone so far as to suggest that you follow those rules. However, there is really no legal reason to be a licensed, registered skydiver.