Dmitry, we are in agreement that a sufficiently large mind altering change is a killing.

But in principle, changing babyeater society does not require the killing of even a single babyeater. Simply keep unmodified adult and child babyeaters separate, and modify the pre-sentient children to prevent them from wanting to eat babies in the future. No sentient being is killed/modified, although freedom of movement/action is restricted.

In practice, modifying babyeater society would probably involve more bloodshed. But as long as this bloodshed is minimized as much as possible, and is less than the harm caused by babyeating, I don't see it as genocide. Is it genocide to kill some Nazi's as part of an effort to stop them from killing innocents?