What is taught in schools has nothing to do with free speech. Actually let me rephrase that. A teacher doesn't have free speech in school, just like no one has

What is taught in schools has nothing to do with free speech. Actually let me rephrase that. A teacher doesn't have free speech in school, just like no one has free speech in the job. A teacher should yeah the school's curriculum. If a private school wanted to reach what you are proposing, it works be their right. But a probiotic school shouldn't be teaching that.