It is you who is confusing capitalism with property rights. Capital is merely the token form of some theory of value, which is often but not necessarily related to real estate or property value assessments, and always defined by whatever government or tyrant holds the current local monopoly on use of force. The same Federal Reserve that prints all the money ultimately collects all the taxes and interest, and uses these same tokens to fund all the wars.
Colonial capitalism, for example, primarily values the extraction of land and goods from colonial victims unable to defend themselves against incoming colonialist oppressors. Modern debt capitalism similarly values the contractual debts from people who, often for reasons of multigenerational feudal or colonial oppression, cannot afford to buy any “property” outright, including whatever property is required to sustain their own lives under current technological conditions (see: subsistence farming). Thus value is extracted from the same victims even as capitalism “matures”, but now it’s called interest or rents, or whatever financial jargon is currently in upper class vogue. The end result is all the same in any case: covering up historical theft, or substantiating current theft of oppression victims’ property including even of self, via capital exchange methods.
Capital has always been a mathematical smoke screen for property theft from the “weak” by the “strong”, however that dynamic is currently defined. Capital accumulation is really just a proxy for access to violent means of human oppression, via slavery or other forced labor. This is why the anti-capitalist phrase “property is theft” is a logical statement based on historical facts, not merely a political argument.