Putting yourself first is not selfish. Quite the opposite. You must put your happiness and health first before you can be of help to anyone else.
Nature is located mainly in national parks, which are vast tracts of wilderness that have been set aside by the United States government so citizens will always have someplace to go where they can be attacked by bears. And we're not talking about ordinary civilian bears, either: We're talking about federal bears, which can behave however they want to because they are protected by the same union as postal clerks.