Why slash their tires when you can have the police arrest them, the local prosecutor press charges, etc.?
Similarly, lots of professions use police power to prevent outsiders from competing with them. Even hairstylists!
There are a lot more unions in the US than people realize. For some reason (I can think of many), high-status workers in the US are captivated by the drama of a few particular unions, and have extrapolated wildly from it.
(Happy to concede there are unions people like, but if that's your best effort at naming two good ones, I think the problem is worse than you're acknowledging.)
If your argument is that people have negative opinions about unions, well, respectfully, no shit. My point is that those opinions are not well-founded.
"Some will rob you with a six-gun, And some with a fountain pen." -- Woody Guthrie "Pretty Boy Floyd"