I am wondering if years of anti union propaganda pushed to the surface the bad examples and all the good ones are just hidden. I am not in a union but what I kn

I am wondering if years of anti union propaganda pushed to the surface the bad examples and all the good ones are just hidden. I am not in a union but what I know from my family that are in such jobs in public or private sector is that6 they get only benefits. Like if they have to work more hours you get paid double for those hours, you are forced to take your vacation days - this means that management can't put pressure on you to work on weekends because they are bad at managing, management will try to optimize to avoid extra hours. Where my brother works he is evaluated each year, there is company wide(multinational) scheme on how people are paid so you can get a raise but there are no 10X mechanical engineers that work 1 night and have the output of 10 good regular engineers. Without this protections the company could promote the people that stay and work extra hours and from home for free or find different ways to abuse you.