"Because they are gone, dead, extinct, or never existed at all. We don't KNOW. We have no proof, other than the occasional story, that they even existed at all, and most of THOSE can be explained by having a few too many drinks at the pub. As for the rest, the Queen has given me leave to use her power, as I have none otherwise. That is where I get the power, the REST is imagination, which is actively cultivated until a certain age, and then allowed to grow or rot on its own. I happen to be one of the ones that grew rather than rotted."