To me, there is obviously a tension between the right of individuals to take calculated risks and the responsibility of the society to protect its members from harm. I don't think it's reasonable to say that individuals have an absolute right to take any risks they please, irrespective of the wishes of their society, because the society will end up bailing them out when the outcomes of their risky behavior get bad enough. Mountain-claimbing is actually a great example: if you get yourself caught in a ravine, there are crews of highly trained, well-equipped rangers who will fly in and spend enormous sums of money, as well as put their own lives in danger, to save your life. All this despite the fact that the risk was taken without consulting them at all. Because of this, mountain rangers have every right to mark certain dangerous trails closed to the public. It is a reasonable infringement on personal liberty, given that they're on the hook for other people's risky decisions.