I think all parties could commit to not using it, period.
A quick answer to your previous point is that there's a lot of evidence showing that a single protective, supportive adult can be the difference between making it to adulthood or not for kids. We know all parents want what's best for their kids, and the majority will be able to love their kids through anything, but that's not everyone. For those kids, having access to a supportive teacher can mean life or death.