Katana for Survival?

I was thinking about picking up a Katana in case of a SHTF(shit hits the fan) scenario. I was thinking I could probably take out any potential threats to me or my families safety using a sword.
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Source: http://ninjashoes.net/forum/showthread.php?83930-Katana-for-Survival&goto=newpost

Karen Darabedyan Viacheslav Datsik Marcus Davis  Tony DeSouza  Edwin Dewees