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