As a human, here is my human take on unions

Because these people don't see the bigger picture. They see they could get $35 if they didn't have to pay the union. What they don't see is that the union is the reason they're "getting" $35 and without the union they're definitely not going to get $35. And obviously any non-monetary benefit (such as more days off) goes way over their heads.

It's not even just about money, and anyone who's worked a union job will tell you that. Many of the benefits of unions aren't completely measurable (e.g. correcting the balance of power in favor of workers, even if just a tiny bit).