Geneen Roth

For some reason, we are truly convinced that if we criticize ourselves, the criticism will lead to change. If we are harsh, we believe we will end up being kind. If we shame ourselves, we believe we end up loving ourselves. It has never been true, not for a moment, that shame leads to love. Only love leads to love.
- Geneen Roth

This is true with teaching, too - we think criticism is the same as teaching, that shaming is an excellent and effective motivator. You can't force an end using an unsuitable means. Only love leads to love.