A possible flaw in your argument
Don't confuse individualism with an inability to cooperate. Voluntary interaction between individuals is an essential part of human advancement. Even Ayn Rand characters interact extensively to accomplish goals. Otherwise, you end up with Robinson Crusoe, without Friday. Interesting, but hardly the basis for a technical civilization.
Libertarians have long praised the ability of humans to specialize when living in societies with other specialists, allowing everyone to benefit from each other. The key difference between this and collectivism is the idea of voluntary cooperation. Free trade is two words. Both are important.