While attempting to give all students access to a high quality of education is an admirable goal, Judge Treu appears to be living in an information vacuum since the data on tenure and retention of bad teachers are hardly as definitive and causational as he seems to believe it is.
"So I guess you just deny that there are any bad teachers at all." This is a popular retort to various forms of "Your system for evaluating teachers is a lousy system." It is a dumb retort. It is dumb in the same way the following exchanges are dumb.