Avira, I pologize. maybe you need to clarify what you call “MO” schools that you cry about. Maybe there is some better term to clarify.
Also, in defense those “MO” schools that do what you say – these schools might have many children from not-very-observant families to begin with. Parents seek a private prep school with Jewish flavor. They may not go to more “Jewish” schools. The “only” problem that kids from observant “MO” families go to same schools and who wins is not known lehathila …