When a company makes a profit, that doesn't necessarily mean they made anyone else worse off. In general, when in a competitive environment, and dealing with customers who are responsible adults (which both hold in the case of the restaurant industry), we should presume that everyone is being made better off by the transactions, that it's a win-win situation.
Well, a union is a form of cartel, it's an anti competitive organization of market participants who are colluding to set prices and extract other concessions from labour buyers. They therefor undermine the ability of markets to maximize value for all participants.
> They therefor undermine the ability of markets to maximize value for all participants.
Currently markets are not maximizing value for all participants, only the wealthiest and owners, so frankly I don't think anyone should give a damn about them
"Labour Buyers" should be counting their blessings if workers just unionize right now
You're acting as if capitalists treat their workers well under the current system when the opposite has occurred. Nearly $50 trillion was stolen from workers [1] by the capitalists owners in the US. Income inequality is literally at worse levels than just prior to the French Revolution.
The first politician to offer $1 trillion in federal assistance to middle/lower classes (free healthcare, free university/vocational training, public housing, public jobs) will absolutely control the electorate at both sides of the aisles.
Remember that redistribution of wealth are very popular American activities. It swings both ways.