Teachers' unions should be vehemently opposed until if/when they demonstrate that their purpose is to benefit and push forward education. Has any teachers' union pushed back against the sort of bullshit pushed by, for example, the Chicago teacher's union? CTA said that the push to reopen schools was an example of white supremacy. If you can't call that out for the complete and utter bullshit that it is, you deserve to be opposed. (For the record, I left my union this school year).