For years know, advocates of the “no excuses” brand of charter school have denied the obvious.  While loudly proclaiming the test scores and graduation rates of the students who remain at their schools, they have denied that their application processes combined with the harsh discipline environments that emphasize extreme conformity to extreme behavioral expectations are forms of “cream skimming” designed to drive out students less likely to burnish their reputations as “miracle factories.”  As time has gone by and evidence piled up, this has become much harder for them to deny with even a hint of honesty.  For example, Dr. Diane Ravitch of New York University, presented the reports of an insider at the New York City department of education on the extreme attrition at most of the so-called “miracle schools”, and demographics of these schools differ greatly from their fully public neighborhood schools.  Part of this comes from charter…