Suppose you’re a IT professional who has an axe to grind against your employer, and knowledge of the company’s network and access necessary to really do some damage. You might consider launching said attack from a free, public Wi-fi hotspot, like the ones offered at chains like McDonald’s. That would be a smart idea – from your standpoint – and make it harder for you to get caught. You might _not_ want to use a personal credit card to buy a meal at said establishment, thereby putting you at the location at the exact time of the attack. That would be a _dumb_ idea.