I still cannot get over how overlooked everything about the Blue Knight is in the original Astro Boy because the twist isn't the fact that the Blue Knight was composed of three different robots that were done wrong by one twisted man. The twist was that these three robots were put in the same body, two of which them were destroyed to made an example of, and that this was done so without the robots' consent or knowing about it by their creator.
If Tonto and Maria were considered deceased, then this kind of goes even further by the fact that they weren't even granted the right to rest in peace by their grieving parent. Blue Bon did not decide to become the Blue Knight until he found out about this fact.
The tragedy of the Blue Knight isn't just the cruelty done to him and his family, but also incomprehensible horror that was done to him by his own parent who he loved and trusted.
Count Berg may have taught Blue Bon Hatred, but it was his father, Dr. Ross, who's actions led him to absolutely give up on humanity entirely.