Insisting that support for unions and support for UBI must be linked is the same energy as insisting that more tightly restricting what food stamp recipients can buy is "helping" them.
But they are completely different approaches to this problem. For example, unions do not protect unemployed people, while UBI protects everyone. On the other hand, a union is something you could create tomorrow at your workplace without waiting for the rest of the country to change their minds.
In some sense, they are competing solutions, because if we had UBI, unions would be less necessary, because everyone who feels abused would have the opportunity to walk away... without ruining their life.
Many people have a very simple-minded view of both politics and the world in general, which leads them to a low-resolution model that lumps things into two massive buckets and assume that everyone else takes their set of beliefs wholesale from one of the buckets.
And CS Lewis is no expert. He's a preacher.
>The robber barons cruelty may sometimes sleep, his cupidity may at some point be satiated.
We wouldn't have any billionaires if this was even remotely true. If having 999 million dollars doesn't satiate you, I submit there is no amount of money that will. We look down on hoarders who fill their house with old newspapers and knickknacks but when it's money hoarding we lionize it.
It's also kind of a mediocre bandaid for deeper social problems. An employer that can get away with asking you to do unreasonable amounts of work, work ridiculous hours, or achieve impossible feats OR ELSE probably doesn't have much market competition.
Also a quote from C.S. Lewis:
“Of all the tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under the omnipotent moral busybodies. The robber barons cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience.”