What an interesting topic.
I don't think the teachers necessarily seek dominance in the kids' lives. I think that too many teachers get caught up in generalizing parents to not give a damn because too many parents don't. So, for those of us who do, we are labeled by teachers first as uninvolved, then have to prove otherwise through the year.
It is an interesting dynamic that we parents have with the schools/teachers. These are important adults in our kids' lives and they are also adults that we don't know well. So, I think that make some of us feel vulnerable and so we are maybe too quick to judge when something happens and isn't handled as we would.
The hard thing for good, involved parents, is having to adjust to a new teacher each year. From kinder. to grade 5, not two of the teachers my son had were alike. Not alike in the amount of homework (first grade was actually his worst for that, with a lot each night), personality, or anything. So in order to help my son, I had to map out what the teacher put importance on.