This video doesn't take Hawking Radiation into account, among many other things...A black hole with the mass of an atom would exist for about 5x10^-97 seconds before it evaporated. I don't know that it could gather enough mass from the Earth to stay alive long enough to kill us all, imagine how tiny the event horizon of the Black Hole would be, it definitely couldn't eat up matter at that sort of rate. I'd have to run the math, but the chance of a black hole being created is basically impossible and the chances of a black hole eating anything IS impossible, as far as I can tell.