"It was considered rather taboo but I never really cared much about what others thought." Still doesn't so even if Gen voiced his opinion he certainly wouldn't be bothered by it.

"Experimenting on the dead was the best way to come up with new ways of fighting. And I lived during a very turbulent time."

A time when sects were fighting over power and who should have it. And he was under the protection of one willing to do anything to get it.