You make a valid point, and from the perspective of a teacher, or someone in charge of teachers, it is necessary to take your view. However, from public policy

You make a valid point, and from the perspective of a teacher, or someone in charge of teachers, it is necessary to take your view. However, from public policy perspective, focusing strictly on teachers may be missing the mark. As an aside, it occurs to me that those teachers who are most effective in underprivileged schools may be totally different than those in wealthier schools.