Part of it is the fact that was aware of that divergence of generations. The tiny chance that he could ensure that another child did not have to go through the horrors that he had experienced, was what served as a constant motivation to be that better person consciously. If only just for Ryuga.

"I have done what I only term as 'my best' in that regard."

Admittedly, that had been easier when his efforts were unseen by anyone who knew the difference. Who knew exactly what kind of cruelty he was capable of. Even if they had not intended it, he feels under far more scrutiny now.