"To the current Avatar,
Recording this message, I cannot help but regret that your predecessor refrained from doing anything that would incite my ire during his tenure as a...hm...guardian of the world. I say such, because I believe he would have made for more interesting discussion than yourself, but I digress.
No doubt you've noticed that several citizens of Republic City's nonbending and former bending community have displayed strange and incredible powers. The ability to render oneself unseen; The capacity to foster a hive of obedient, ravenous insects in one's body; The power to create phantasmic illusions to scout and distract; Along with the utilizing of elemental methods of offense and defense you may be more familiar with.
A gamut of trivial questions must have risen since these incidents: How, Why, What. For the first, I say with all due respect, you could never hope to grasp the science behind these occurrences, so I won't even bother trying to explain. As for the second, because I can't very well release a product untested to my peers...if I can help it. And regarding the last, the future, my dear, it is the future.
And now you quiver with humiliation and rage, barking: But what of the painful withdrawals, the heightened aggressiveness, etcetera, etcetera, etcetera? As someone who was practically handed a veritable smorgasbord of fortune, you must be made aware that greatness comes with a price.
These people you have so concerned yourself with were parasites, layabouts, and do-nothings. Constantly moaning for someone to save them as they sat on their hands and latching on to whoever promised them a shinier tomorrow: The Council, The Triads, The Man in the Mask, You. My product has liberated them from their weakness, put them shoulder to shoulder with the hardworking, ambitious and visionary peoples of the world. The recent bouts of chaos and instability have rendered the City in desperate need of strength and independence. The side-effects are merely all the discomfort and sacrifice one must bear to be exceptional, concentrated in a small frame of time. It's a mutually beneficial exchange, really. They can save themselves, be masters of their own destiny, free of natural weakness and their own personal excuses, and I save my patrons grief by refining my catalogue based on the results of Republic City's consumption.
Your ignorance partially lifted, I urge you not to interfere. There exists a possibility that your meddling could corrupt the data and I can't have that. Stick your nose into my business and I will be forced to levy reprisals of an extreme nature upon you. Make no mistake, I have devices and inventions at my disposal that make the machinations of that socialist worm, Sato, look like tinker toys. Your involvement would only escalate the speed and severity of the testing as well as the...collateral damage.
Ah yes, there must be one last, big question rattling around that thick skull of yours: Who? To that I answer, a free man, an individual liberated from State, Law, and Spirit.