Mark, how can you not see... If no one feels left out, it'll be a better world...I mean if a kid can't pass and should wear a dunce hat, we should pass him so he feels "part of the group". Never mind that he can't tie his shoes or read "cat in the hat", at least we have prepared him for a world where everyone is part of the group.
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I'm sorry, no, let those kids get left out. It'll get them ready for the real world.
I could imagine if that happened to me when I was in school...
Teacher: Why don't you want to invite them?
Me: because they suck!