> Say he was a high-ranking professional or a successful entrepreneur and he used the capital he earned to buy a building - what's immoral here exactly?
he’s using his capital to extract more wealth from those with fewer resources than himself. (that’s also how he accumulated the capital in the first place — but that’s another conversation.)
"Capitalism" is just liberty + private property. The idea of a free class of citizens has been around for millenia, and the idea of private ownership of property has been around for longer. Property owners and tenants have existed since the dawn of agrarian civilization.
The radical innovation of the last few centuries was the private, limited liability corporation, but that's not really the problem here is it?
> he’s using his capital to extract more wealth from those with fewer resources than himself.
As every living thing competing with other living things in an environment of material scarcity has done since life began.
you just made my point for me — there is a class of the population that is forced into spending a third (often more!) of their income on housing, which is being hoarded by another class. no different from a feudal serf being forced to turn over their hard-won harvest to the nobility. but sure, they can go find another manor to live on, they’re under no obligation to give their labor to this particular lord...