In the eyes of capitalism, it's certainly legal and to a certain degree, expected that profits accumulate at the top, but I don't believe the majority of the population ever thought of it as a "fair" arrangement.

What I'm trying to say is that your framing of the issue in terms of "fairness" isn't very productive. It may be your opinion that any given arrangement is fair, but the concept of "fairness" is really just a social construct. If your fellow citizens disagree, they are ultimately the ones who will rally to change the system. At first electorally, and failing that, through violence.