About 6.2 million students attend California’s K-12 public schools. Of those, over 570,000 are enrolled in public charter schools. Most of these charter schools operate with a degree of management autonomy and teacher accountability that goes well beyond what is permitted by the union work rules that govern traditional public schools. These charter schools themselves are accountable – if they don’t deliver better academic outcomes cost-effectively, they are closed down. They are a laboratory for excellence in education and administration, and they’re working. And their success is a tremendous threat to teachers unions.

Enter the ACLU. In a study released earlier this week, the ACLU said it had identified 253 schools with “exclusionary policies,” and noted “this is just the tip of the iceberg.” The exclusionary policies were (1) exclusion based on academic performance, (2) discrimination against English learners, (3) pre-enrollment essays or interviews, (4) illegal parent/guardian volunteer requirements, (5) requirements that discourage undocumented students.

If you consider the ACLU case on its merits, there isn’t much to argue about. Traditional public schools receive funding to admit all students, and charter public schools must do the same. But the entire premise is flawed: schools should be able to develop unique identities in order to offer a diverse set of educational choices to our diverse student population.

Examples of such diversity are inspiring, and range from the Eagle Academy in Harlem, which is attended almost exclusively by African American young men, or the Detroit International Academy for Young Women. These schools deliver outstanding academic results, they cannot possibly admit everyone who wants to attend, and they are exclusionary.

Some of the premises underlying the ACLU’s case are easily contestable, because they are rooted in a concession to mediocrity that has taken over public schools. Instead of making charter schools change their policies, why not change the rules? For example, why aren’t all public schools engaging in “pre-enrollment essays or interviews”? Why don’t all public schools require parents to volunteer some time at the school?

As for violation No. 2 – our public schools are academically segregated as it is, with the high-achieving students exclusively taking AP courses that relegate their exposure to the rest of the student body to hallways and common areas. Should a charter school focus on attracting top students? And if some of them did, how would that differ from what already occurs with AP courses?

The ACLU’s case with respect to the other violations is, at least, easier to justify on moral grounds. Of course we should be admitting students who don’t speak English as a first language. Of course we have to educate children regardless of their immigration status. But the vast majority of charter schools aren’t trying to exclude these students. Most charter schools are non-profits, with supplemental funding provided by philanthropists with the noblest of intentions. Charter schools are an attempt to deliver educational excellence in communities with some of the worst-performing traditional public schools in the U.S. The ACLU is missing the forest for the trees.

If the ACLU wants to fix public education, it might throw its considerable legal might behind the upcoming final round of the Vergara case, likely to be heard in the California Supreme Court next year. The plaintiffs in this case argued that the right to a quality public education is a civil right, and that students in low-income communities are denied that right through inferior public schools. They specifically challenged three union work rules which they demonstrated had a disproportionately negative impact on education in low-income communities: (1) granting teacher tenure after less than two years of classroom observation, (2) “last-in, first-out” policies whereby seniority trumps merit in layoffs, and (3) dismissal procedures so onerous that incompetent teachers are almost never fired.

Where is the ACLU with respect to Vergara?

The ACLU has a well-earned reputation for impartiality. When it comes to civil rights issues they are as likely to defend someone on the far right as someone on the far left. For this they have earned animosity and respect, depending on whom you ask. But if the ACLU intends to be truly impartial on the civil right to a quality education, at the least it may use its resources to support the plaintiffs in the Vergara case.

As for the ACLU’s salvo against charter schools? The organization should realize that charter school operators are almost invariably motivated by nothing more than providing excellent education to underprivileged students. They should be making it easier for them to do that, not more difficult.

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Ed Ring is the president of the California Policy Center.