Because you can never be too prepared for the inevitable collapse of society.
Because, let's face it, you never know when you'll be stuck in a bunker with only a 2-week supply of SPAM.
Step 2: Learn to make a mean SPAM-fried egg
Also, consider investing in a good pair of duct tape pants. They're like a Swiss Army knife for when society breaks down, but without the risk of actually being a knife.