Here are some possible contenders for why not:
http://tinyurl.com/pt2ee9k The risks of underinformed public servants...
http://tinyurl.com/nyy9vjr The risks of massive tourism (which is why the twice-as-old cave found recently is now airlocked and accessible only to small groups of scientists for short times)
http://tinyurl.com/ldpafxr Also risks from massive tourism (the WNS fungus has been proven to have spread in some areas due to cavers not disinfecting their gear properly)