never understood the "promote laziness" thing. A union wouldn't be able to protect a worker that can't meet the requirements of the job.
Overachievers get told to stop being better than the lower-quality workers in poorly run unions because "it makes Bob look and feel bad when you do twice the work he can in a day"
It's not a great reason but if you experience it once it leaves one hell of a sour taste in your mouth, especially since poorly run unions also usually aren't doing good at protecting workers