I work for a school district. One of our high schools recently installed cameras in the bathrooms. The reason they can get away with it is because the stalls go from floor to ceiling. So I guess the good stalls are a small win.
Doing this in all restrooms, as a response to vandalism or the dreaded smoking, arguably makes sense. Doing it only for the kids officially hated and required to use a segregated restroom that's only for them, is not security, only cruelty.