Because unions don't let the market work. They physically attack "scabs" who would do the job for less without the bad attitude. They force all workers to pay t

Because unions don't let the market work. They physically attack "scabs" who would do the job for less without the bad attitude. They force all workers to pay them dues once a site is unionized (something that right-to-work laws are intended to redress). The union bosses like Andy Stern rake in the bucks for contributing negative productivity. And in the mid to long term they cause the demise, migration, or automation of an entire industry. That's why Boeing moved its plant out of Washington State, and one of the reasons Japanese car companies invest so heavily in robotics. Talk about killing the golden goose. From the standpoint of the consumer and employer, who must deal with their strikes and surly attitude, unions are a disaster. From the standpoint of the above average and exceptional workers, they are also a disaster as unions exert peer pressure to stop people from working hard and "showing up" the unproductive workers. In a union workplace, all promotions are based on seniority rather than merit. And unions have a history of racist targeting of "outsiders". You could not think of a culture less compatible with the tech industry, let alone a Silicon Valley startup.