So this isn't a classical union that's requesting more money for the workers or anything. It's the new sort of union which tries to force companies to take sides in the culture war.
It's thus not a surprise that a significant proportion of workers wouldn't want to be a part of that, and well, the sort of people who were unionizing the firm were doing so explicitly to support physical violence. US unions have a long history of violence already.
https://www.washingtonpost.com/business/2019/10/10/how-debat...