Military weapons
In my opinion ghouls were not created naturally but rather they were a scientific experiment which aimed to the creation of powerful soldiers whose purpose was the increase of the military power. If you really think about it, their anatomy allows them to live for a whole month only be eating one corpse. That being said, they don't even require any other resources for their maintenance and thus once they're produced, they can be very useful. The RC levels can be very well be something that was developed by humans exactly to work via injection or something. CCG could very well be a special "branch" of militay that was created for that exact reason and thus they have partial knowledge of how to use ghouls' kagunes as their weapons.
Historically plausible
My reason for saying this is that till now, strangely, we do not have data from ghouls that existed in the long past. In fact, from what I gathered, we could say that ghouls started to exist the last 100 years or so since the oldest ghouls we have seen is Anteiku's boss or a granny looking ghoul who had attacked Amon at his very first investigation.
What went wrong
Most probably ghouls were not easy to control and so they ran away from the military. I would actually go as far to say that the very first 2 ghouls were "one-eyed ghouls" since they were genetically evolved humans and from them the very first complete ghoul was given birth. If those one eyed could only eat humans, that said first complete ghoul would gain nutrients only from humans and that's why ghouls are human-only eaters in the first place.
Professor's Kanou role in all that
I believe that the reason for which he's so obsessed with the one eyed ghouls in specific is because they might have some kind of special genes compared to the rest of the ghouls. If you really think about, one-eyed ghouls are supposedly way stronger than the rest but we still haven't given a specific reason for that. It might be something that the first half ghouls had but was lost through the repoduction or it might be that having to eat only humans has a certain drawback or something. I would as far as to say that ghouls are a failed experiment and that the real purpose of the military was to create half-ghouls that wouldn't have that certain unknown drawback that the complete ones have.
Currently on manga we've seen that Arima, by sparing Kaneki, they suceeded in the creation of hubrid human-ghouls who can eat like humans but they're not as efficient as real ghouls.Therefore, a "succesful result" would be the creation of perfect hubrids and that may be the reason for Arima asking from Kaneki to teach one of his students (hybrid ones again) in such a way that would surpass him. Finally, the difference between Arima ad Kanou is that while the first just wants to create superior soldiers as a military weapon, Kanou desires the extinction of humans, seeing them as inferior beings, and thus he only cares for bringing out ghouls' full potential, even if that means to turn them to humans only eaters- as opposed CCG's agenda.
I hope you liked it guys
In my opinion ghouls were not created naturally but rather they were a scientific experiment which aimed to the creation of powerful soldiers whose purpose was the increase of the military power. If you really think about it, their anatomy allows them to live for a whole month only be eating one corpse. That being said, they don't even require any other resources for their maintenance and thus once they're produced, they can be very useful. The RC levels can be very well be something that was developed by humans exactly to work via injection or something. CCG could very well be a special "branch" of militay that was created for that exact reason and thus they have partial knowledge of how to use ghouls' kagunes as their weapons.
Historically plausible
My reason for saying this is that till now, strangely, we do not have data from ghouls that existed in the long past. In fact, from what I gathered, we could say that ghouls started to exist the last 100 years or so since the oldest ghouls we have seen is Anteiku's boss or a granny looking ghoul who had attacked Amon at his very first investigation.
What went wrong
Most probably ghouls were not easy to control and so they ran away from the military. I would actually go as far to say that the very first 2 ghouls were "one-eyed ghouls" since they were genetically evolved humans and from them the very first complete ghoul was given birth. If those one eyed could only eat humans, that said first complete ghoul would gain nutrients only from humans and that's why ghouls are human-only eaters in the first place.
Professor's Kanou role in all that
I believe that the reason for which he's so obsessed with the one eyed ghouls in specific is because they might have some kind of special genes compared to the rest of the ghouls. If you really think about, one-eyed ghouls are supposedly way stronger than the rest but we still haven't given a specific reason for that. It might be something that the first half ghouls had but was lost through the repoduction or it might be that having to eat only humans has a certain drawback or something. I would as far as to say that ghouls are a failed experiment and that the real purpose of the military was to create half-ghouls that wouldn't have that certain unknown drawback that the complete ones have.
Currently on manga we've seen that Arima, by sparing Kaneki, they suceeded in the creation of hubrid human-ghouls who can eat like humans but they're not as efficient as real ghouls.Therefore, a "succesful result" would be the creation of perfect hubrids and that may be the reason for Arima asking from Kaneki to teach one of his students (hybrid ones again) in such a way that would surpass him. Finally, the difference between Arima ad Kanou is that while the first just wants to create superior soldiers as a military weapon, Kanou desires the extinction of humans, seeing them as inferior beings, and thus he only cares for bringing out ghouls' full potential, even if that means to turn them to humans only eaters- as opposed CCG's agenda.
I hope you liked it guys