The Possible Bat-Secret

Does Batman not kill any of his 'Rogues Gallery' villains because he wants to keep them alive long enough to learn crucial 'Human Psyche' elements from them? Could it be that the "World's Greatest Detective" is keeping all his 'case studies' in one basket (Gotham/Arkham) so he can use his ingenuity to carry out a continuous series of studies/research that will help him discover the root of all criminal intent in Humankind? All so he can devise a bio-chemical way to eliminate crime altogether (on a genetic level) and usher in a world (next generation) free of crime and criminals? We know he'll go to any extent to do what is right, considering he safeguarded a handful of Kryptonite to take down Superman if he ever went rogue. And not to forget the way he crafted Plan-Bs for all Justice League members, including himself, in case any or all of them 'misused' their powers to the detriment of ordinary people. His need to eliminate crime starting at the root –as thoughts and intentions inside criminals' minds and hearts – is reasonable. After all, Batman's entire crime-fighting inspiration sources from his need to prevent others from suffering the same/similar loss as he did when he lost his parents to a shooting in an alley. The incident completely changed him, making him sacrifice a simple life for one spent in eternal darkness fighting crime and being ever-exposed to the cruel side of Humanity.