Did she support it or did she begrudgingly go along with it while making it clear to him she didn’t support it? Both of those could look the same from a distance and without knowing the inner workings of their relationship. Apparently the killer mentioned his mother’s lack of support as motivation for his actions.
“did she begrudgingly go along with it while making it clear to him she didn’t support it?”
If true, then as a parent she sucks. Children ruling their homes isn’t really their fault when the parents allow it.