As much as I dislike teachers for carrying out the orders of their bosses on children, it is nevertheless the case that the whole framework is set up by those at the top; the bottom are naturally employees who do their jobs and are least empowered.
Bosses naturally hate unions because even a weak union carries the possibility of underlings saying "No" to their commands — and getting away with it. A form of defiance.
Evaluating teachers "based on student outcomes" is obviously a trap against teachers, if bosses are the one who define "student outcomes". That means teachers will do awful things like teach to tests. (Clearly, education management isn't about to check "student outcomes" in any reasonable manner.)
Bosses naturally hate unions because even a weak union carries the possibility of underlings saying "No" to their commands — and getting away with it. A form of defiance.
Evaluating teachers "based on student outcomes" is obviously a trap against teachers, if bosses are the one who define "student outcomes". That means teachers will do awful things like teach to tests. (Clearly, education management isn't about to check "student outcomes" in any reasonable manner.)