Maybe I have unfairly criticised this series a few times, for neo-Leold to take the original Leold's sins as his own so profusely and personally, instead of merely accepting that he must carry the consequences of those crimes, yet still knowing he wasn't the one who did all that. However, reading the beginning of this chapter made me realise this might be an issue of cultural differences. Japan has that whole inherited debt system and culture, which is also the initial setting of many a drama manga, so the Japanese just view things differently. Sendou Makoto simply accepts all of Leold's outrageous crimes as his own because that's how he grew up to act and believe back in Japan. Just like in Japan his parents' or disappeared sibling's debts would have fallen on him, and he would have had no choice but to deal with it, whether he liked it or not.
NGL, I hope she actually did some research later on to find out if that village really was consumed over night by a random plague. It just feel very convenient, the perfect lie to tell a child to keep her on the straight and narrow.
Seeing how she's running her own intelligence operations with professional spies and everything, it's quite impossible she wouldn't have checked it out eventually. But maybe even if it was a fabricated story to make her obedient and motivated as a child, she might have accepted it later nonetheless, having become wiser and realised her role in life, at least intellectually, even if she still wished for freedom emotionally (who wouldn't?).