@NateVG
To me it feels like a classic case of a parent who tries their hardest to give their kids a better upbringing than they had but doesn't realize that that better upbringing is still fucking terrible.
Like from Mutsu's POV she did a good job: she kept Mirai from being brainwashed into a womb-sama by not telling her shit and sending her to regular school, and she kept what's his face (glove guy) away from whatever awaited him in the side branch by sending him away from the family. In reality they both had awful childhoods.
I think a big factor here is that it sounds like Mutsu (and Nana and Yoshie) was home (cult) schooled so she probably has a pretty idyllic view of real school and the secular world in general.