Not all of them. I personally know several bright, intelligent, competent teachers who are also caring about their students. Of course, they feel like foreign agents in the midst of the education industry and often must teach surreptitiously in officially unapproved ways to impart knowledge to their students.
Our neighbor and a family friend are also teachers and very competent. They are also very conservative and really care about the students as does our daughter. They all have students that pass the TAKS (Tx assessment of knowledge and skills test) with no problems.