... if only that were true.
The reality is that if you go off and do something stupid ... and injure or kill yourself ... the chances are quite high that you or the surviving members of your family will do your utmost to find some legal way to make it somebody else's fault.
That's a separate societal problem - structuring our legal system so it's not a lottery for enriching fools. Human nature isn't going to change either way - people in some of the most authoritarian nanny states still find ways to live AT the limit of their risk tolerance.