Exactly. I object to the whole premise of both the Costco letter and the article, though the letter is better than the usual corporate response of trying to fire people who maybe have a thought about organizing.
"This is a great way to begin your response to employees telling you there is a problem -- which is what unionizing is."
Bullshit. Unionizing is organizing to balance out the power relationship. There doesn't need to be a problem to unionize.
Every worker should be in a union. That way, if there ever IS a problem, you don't have to say "Damn, I wish there was someone on my side."