I think one of the problems with teachers is that many of them have never had jobs outside of school.  They grew up in school, went to college and graduated with debt to teach in school.  They are caught in a closed system (created by unionization, true).  The other problem with teachers is that they are used to having the answers, assume they are the authority and tell everyone what to think, and that everyone else around them doesn’t know as much as they do (which is true), but it breeds an arrogance.  This is a sweeping generalization, though.  I am sure that there are a lot of teachers who love Trump, but likely have to do so in secret.