Earlier quoted context omitted.
Divisive between whom? Workers themselves or workers and managers/owners? I would suggest not discussing unionization with your manager like you would with a peer-worker.
Sure, I agree with your implication there, but you never know what peer-worker has goals of becoming your manager and in the case of labor organization, might benefit from informing mangers/owners of peer-worker organization. What are we left to do then? The feelings underlying my comments here are that I think it's important to not shy away from divisive topics in the workplace. OpSec only goes so far. At some point…
I agree conditionally, since there isn't one kind of "divisive" topic. Some kinds should be avoided, which are the ones people usually are talking about when they say politics should be avoided the workplace. The main thing that comes from them are disruption, polarization, and nasty feelings. Other kinds, like ones that are "divisive" between workers and owners, should be tolerated or even encouraged, since they are appropriate to the context and can lead to genuine improvement within it.