Will I ever need to power-down my PC that quickly?

Who's idea was it to incorporate a power-off button onto keyboards? What is the point? And especially, why put it next to another commonly used key? On my Genuisnet.com keyboard it is just below the Delete key. I've lost count of how many times I've knocked it, and all my applications have suddenly closed right in the middle of programming. Aaarggh!! If I want to turn my PC off, I'll press the power button that sits on the case approximately two feet away! Why do I need it on the keyboard?!?!