A good teacher will inspire kids, will get them to work together, will be a person to go to. What evidence do you have that even a fraction of teachers do this

A good teacher will inspire kids, will get them to work together, will be a person to go to. What evidence do you have that even a fraction of teachers do this? And what evidence do you have that teachers "worked for the developed world" (i.e., had some measurable beneficial effect)? There will always be bad teachers, and outrageous stories about them making way around the internet. The stats suggest lots of them are bad. Rather than more teachers, maybe what we really need is a device to ensure that teachers actually come to work and the political will to stop paying them if they don't.