Why not just operate a company in such a way where unions don't feel like they need to exist? Unions are a self defense mechanism and a symptom of a failure in trust between employee and employer. Unions aren't about logic, I don't see the point in reasoning why unions should or should not exist or trying to sway opinions before/after the fact.

> "I believe unions promote a corrosive us-against-them dynamic"

Unions are a blunt instrument people feel forced to use to correct a "corrosive us-against-them" culture. Unfortunately unions create as many problems as they solve, but at least they won't have to worry about putting food on the table, everything else is tolerable.