So, yes, capitalism in the sense of the freedom to trade one's labor does appear to be naturally and universally emergent in advanced human societies, in the absence of violent interference.
To the extent that certain aspects of capitalism lead to violence, those are elements that other parties -- generally corporations or governments rather than writers or philosophers -- added to the ideology.
People die trying to break out of non-capitalist countries, while they die trying to break in to capitalist ones. That's one possible way to tell the good guys from the bad guys.
Ahahah, I absolutely love this sentence. You might have said the quiet part out loud though.
“You gots to understand”, said Fat Tony, “I'm not a violent man. The violence simply comes in when you interfere with my business.”
But capitalism prevails and may be the best system there is for now because I cannot fathom a change in system overnight that would not result in mass suffering for (almost) everyone.