Being anti-union is inherantly being for the workers, not the overseers.
I forgot to add the third aspect of "after union" - you make 20% less pay and your union leader lives in a mansion.
Both of these assertions are such complete bullshit and make it obvious that your entire knowledge of unions is based on no real-world experience with them.
Let's start with your "like teachers' unions" analogy. Right there you've equated a union in a public service job (government paycheck) with all unions, which is ridiculous. Yes, it's true that it's tougher to fire a teacher than it is to fire a McDonald's employee. It's also true that you have no clue about how private sector unions are formed, or why they're formed. Their primary purpose is not protectionism, it's to get paid more. You can't just lump all unions into one box and declare they're all evil. Are some corrupt? Yes, of course. Do people like you then erroneously believe they're all corrupt, just because you've got some right-wing dogma implanted in your Archie-Bunker-like skull? Yes, you do.
When the people with 99% of the money dictate what you should be paid, and their decrees have nothing to do with your fair market value, because they're a near-monopoly that believes in getting workers for the absolute minimum amount possible, the only way to push back is with a union. You can't do it yourself, period. I'm in a union of freelancers (not programming or IT related, but I am a technician) and before the union was formed, the people in charge of setting the rates for freelancers had a "take it or leave it" attitude, even though their profits was very very comfortable - that didn't matter, they wanted more. Well, guess what? Us freelancers wanted more too. We got the union formed, and my day rate went up about 30% almost overnight. And was there less work as a result? Not at all. The execs and shareholders making the money are still making money, they're just making a little bit less profit than they were before. It's not like they were going to say, "Oh we were getting .26 on the dollar before, and now we're only getting .23 on the dollar.... fuck it! let's shut the whole operation down."
Everyone wants to make more money. Unions are the only way for the workers to push back - if workers don't push back, they'll just make less and less and less over time. Take your anti-union rhetoric and toss it back to Fox News where it belongs. The real world is much more complex than the simple cliches you've trotted out.