Americans love feeling like they're about to be rich (all 300+ million of us), thus unions are bad because they redistribute power to the poor.
On top of that, the percentage of millionaires on HN is probably closer to 80% than 8% so that hackneyed slogan has little resonance with this audience. Then add in that many, many developers get a massive chunk of their compensation in stock or options, which literally aligns their interests with the owners of the company because they _are_ part-owners of the company, and that slogan is DOA.
Unions don't do that, that's pure propaganda. Unions bargain for more free time, better pay, better work conditions (healthier, safer).
They do that AND make it hard to fire useless employees. It's a mixed bag, as all organizational layers are.