They have no real knowledge or skill, and they do not know how to acquire it. It is ludicrous to think that someone who can barely function in physical reality will be able to convey to students a heartfelt interest in science, real knowledge of nature and the physical world. A teacher who cannot even find the fuse box in the school certainly cannot teach children about the miracle of electricity. An educator who does not know how to test the batteries in her portable radio cannot teach children about the field of electronics. An educator who cannot change the oil in his own car cannot speak to children about rotary motion or how engines have changed the world.
Educators are incompetent.
All educators can do is communicate their own incompetence, disinterest and contempt for the knowledge of physical world reality. Educators think that if you memorize the essentials of something, then you know about that something. Learning in school always means memorizing no matter what anyone says. Science is knowledge of the physical world and nature. This knowledge cannot be acquired through memory.