Well, there are bad teachers and then there are bad people who are teachers, so I am not certain of which you are asking about. But being the thorough teacher that I am, I will try to at least cover some of the issues with each.
The first group I will call poor teachers (well there are not a lot of rich teachers LOL) but I mean poorly skilled teachers. These are teachers who are poor communicators or people who have not fully mastered their subject area's material. They may frustrate their students when they cannot clearly explain things, or provide more than one example. They may get frustrated with their students when they don't learn something the first time it is taught. And sometimes they may just not teach their students all that much which will lead to lower achievement and possibly even a lack of desire to learn the subject any further. Often these are young teachers who are learning the craft, and sometimes these are teachers who have burned out and are just hanging on until they can retire. These are people who the whole process of tenure should weed out and it is why in the profession we need administrators who were actually classroom teachers. Teachers with poor skills need to be taught to do better or shown the door. Three years is plenty of time to correct this or sort them out and send them on to another career.
The second group of "bad teachers" are bad people. They would be a cancer no matter what career path they followed, but finding them in the classroom is the most troubling place they could be. Teachers like this are miserable in their jobs (for whatever reason) and this has an adverse effect on their students that lasts well beyond the time they have the student in their class. They can turn their students off from becoming educated and that is a harm that can last a lifetime. They are people who are there collecting a paycheck rather than building people who can succeed in the world. When someone like this makes it into the classroom it is important that their inadequacies are thoroughly documented so that through due process they can be removed so they do no further harm to their students. (Again it gets back to good administrators doing their jobs
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Not even related in the slightest, please read the section in the article
Bad Teacher Influence A blueprint to consider is, learning AI can be harmed from bad teachers, for example Microsoft Tay of traits of prejudice, racist, unjustness, etc. Was a learned characteristic. What we need is a guard against bad teachers.
Microsoft AI Tay had bad teachers that distorted and worsen the outcome of Tay, feeding a self-protection network against bad teachers with the intent of swaying the AI towards the negative direction. Having its own internal ethical compass aligned towards the positive direction is the key.
An closed system is something to consider, where the AI is taught first. Built with an inner-web of positive attributes first and an internal defense against bad information. Taught to know what's right from wrong. Taught to reject bad teachers, and to filter out the bad information. Tay outcome is not what humanity needs.
