There are multitude of instances of professional misconduct that can take decades if not years for a school and district to deal with. I’ve had a misogynist teacher who bluntly said girls aren’t strong enough in math to do engineering and spent the entire year discouraging any girl from thinking about a STEM field. I had not one but 2 teachers eventually fired from my school for inappropriate relationships with students. There was the Spanish teacher a few years from retirement who sat at the front and didn’t teach anything and if students got a bit too loud in their wasting time threw books at them (granted that was a popular class as everyone got an A). And I was in the most advanced classes my school offered! There was a reason over half dropped out of school without graduating.
Even in my kids’ extremely strong middle class district we’ve seen exactly how long it can take for a teacher to be removed - even after years of complaints. I’m not subjecting my kids to abusive and incompetent teachers. I see no reason to teach them to accept unacceptable behavior - that serves no one in the future.