I'm pretty sure there is no fundamental law of the Universe that makes it so, only the fact that it is allowed to persist in this state by the multitudes who actually (but unknowingly, it seems) hold the power to change it.
You know, "if only there was a way" for employees to unite, and therefore increase their bargaining power with employers.
Make no mistake, I'd rather see that, too. But look around you. Is that how the real world really works? Is that the way of human nature?
It sure is nice to lounge around in some libertarian ivory tower, and pontificate about how people are such rational agents, and all that nonsense. Whereas outside it's Hindbrain City all the way. Look at how most people choose their diet - and look at the effects thereof - just to name one out of many chronically idiotic decisions that the masses do.
What you're proposing is not rational, it's a pipe dream (or the typical libertarian anti-union dogma). The rational thing is not to sit on your ass and do nothing. The rational thing is to recognize that there is a problem, get up, and fight.