You're banned for banning the person who banned you, hence coming full circle. Why is that bad, you ask? Well, circles release carbon into the atmosphere by practicing a theory called 'loop science', where atoms go around and around and around, creating friction. Friction, as you know, creates heat, and if heat affects the Greenhouse effect, then for these reasons, circles do. Do you want to cause Global Warming? You might as well punt a penguin. DX