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The most known creator of Anarcho-capitalism conception is Rothbard - that's true.
Ayn Rand didn't see the way Anarcho-capitalism can work without violence.
This was the imperfection of her point of view.
By saying "Ayn Rand have said so much nonsense" You should explain why You think so.

3 quotes:

  • "As a human being, you have no choice about the fact that you need a philosophy. Your only choice is whether you define your philosophy by a conscious, rational, disciplined process of thought and scrupulously logical deliberation — or let your subconscious accumulate a junk heap of unwarranted conclusions, false generalizations, undefined contradictions, undigested slogans, unidentified wishes, doubts and fears, thrown together by chance, but integrated by your subconscious into a kind of mongrel philosophy and fused into a single, solid weight: self-doubt, like a ball and chain in the place where your mind’s wings should have grown." Philosophy: Who Needs It, 5

  • "There are only two means by which men can deal with one another: guns or logic. Force or persuasion. Those who know that they cannot win by means of logic, have always resorted to guns."

  • "Competition is a by-product of productive work, not its goal. A creative man is motivated by the desire to achieve, not by the desire to beat others."

For a fuller view of her thoughts I recommend this:
https://campus.aynrand.org/lexicon

Can anyone give any statement about anything not knowing it?
I consider myself an Anarcho-capitalist and still .... I am in favor of Rand's philosophy. I think they play excellent together. Mrs. Rand misjudged Anarcho-capitalism, but on almost every other matter she was right.
I encourage You to read her books. Best order:

  • The Fountainhead
  • Atlas Shrugged
  • The Virtue of Selfishness