Because there’s total moral equivalency between a private school which chooses to conduct their business in a certain manner with specific standards which applies just to their student body vs Islamic radicals who force everyone to follow their views.
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Well, try to bear in mind also that this private school which chooses to conduct their business in a certain manner with specific standards had absolutely no problem playing this exact same team with the exact same roster as long as the gentleman’s agreement that she would not play was honored. It was only when the young lady was going to actually play that it became an issue. Those are some principles, eh?
You're welcome to keep spinning this around, but I believe that they have the right to exercise their beliefs, however they want to. If the school was trying to claim a win or a tie because the other team wouldn't follow their rules and ban the girl from playing, that'd be imposing their beliefs on others, and I'd be against it.
But so long as they are exercising their freedom of association, and conforming to their rules, as well as the rules of the association they're playing in, I don't see anything wrong with what they did.