"And many more, I'm afraid. Interesting and useful as it is, it's still like playing around with dynamite. You can be reasonably certain it won't explode in the most inadequate time, but the risk is ever present. Now think of a whole city with dynamite attached to its walls, pockets, schools... And anyone willing could just grab some and play around as well. One could think that could be useful, yes. But in truth it's more dangerous than any other thing... Unless properly taught. But if we could all learn? What a marvel would that be, hmm?"