All public schools that I know of play in the South Carolina High School League. It's not a "public league". It's a league as defined by the constitution and by-laws for "interscholastic play", not "public school play". The members of the corporation vote and participate in the governance of the league. Since public schools in SC are members of the South Carolina High School League I guess they don't all share your views as private schools are allowed in the league.
