I'm no mental health expert but isn't mindfulness a proven method for improving one's mental health? Schools can't fix dysfunctional families. All they can do

I'm no mental health expert but isn't mindfulness a proven method for improving one's mental health? Schools can't fix dysfunctional families. All they can do is give kids some tools to cope with such challenges. Even if it doesn't help a particular child, why would it be wrong to at least try?