Actually what we're talking about here is not being rich. Having a couple million dollars and a 6-figure household income is being rich. What we're talking about here is being obscenely, disproportionately wealthy to the point where you can control governments, brainwash the masses, have small armies at your disposal, and not give a crap about the consequences of any your actions because you have multiple places to hide if all goes to hell.

In a case like this the word "immoral" is too soft. I would maybe use "depraved". But these people are just a consequence of the society they live in. Ask people around you if they admire Bill Gates, or Michael Bloomberg, or Mark Zuckerberg, or any other billionaire of your choice. I'd bet most people will be telling you about how much they admire them and how awesome they are. We live in a society where greed is virtuous and compassion is scorned. Hell, these people even use "charity" as a means to avoid paying their fair share of taxes, and to get people to think they're philanthropists.