I believe not anyone is qualified to be teachers. Yeah everyone can teach something, and parents are the teachers even if they are doing a bad job in it.
But what I mean is that sometimes you have to have certain qualities to be able to teach children in school or something similar. Academical knowledge is the least important of them. You need to have patience, being able to take criticism from someone generation(s) younger than you. You need to be good example for honesty, time management & stress management.
When normal people teach, they don't need these. But I believe not everyone is qualified to be an actual teacher.
Qualification is another matter though the role of a teacher can be done by many people. As you say, Academical knowledge is the least important of them, and I can also add all the pedagogy thing, which ultimately is just nowadays a fancy word because it shows no tangible weight.
And the skills to teach resides in everyone because we all have the power to teach ourselves. And then we can analyze how this process takes place. Our brain is a sponge no matter how inactive it might be. And what is required is observation to identify the needs of each students.
Naturally, there are people that don't succeed in teaching in school, but that doesn't mean they can't. Probably, they're using wrong approaches or their idea about education is different. And when it comes to the aspects of life, sometimes we don't notice, that in a way or another, we're definitely teaching.
I agree... I said my previous comment becaue it saddens me how many teachers take the job just because of money.
They don't have patience & guidance ability to make children better men/women in the future, still, they take the job and not realize how bad they damage humanity.
Of course, there are many great teachers... It just saddens me that what I said above exists.