There are a lot of ways in which cooperation is possible but the fact is that same opportunity exists with nearly everyone. Virtually no one wants suffering of other people. Here is the crux:
==There is no reason to force anything on anyone and no reason for anyone to force anything on you.==
Force is not a universally agreed thing. The Libertarian definition of force is different than the socialist one. So it is impossible to say that neither would force each other because within their own worldviews, they are not. That is just an objective fact, one that must be dealt with.
Can own real property? A Libertarian would say yes. No force is involved there, but from another perspective no you can't, because that is force. They are both internally consistent views but incompatible.
We cannot gloss that over.
Force or the Non-Aggression Principle is a floating abstraction without a grounding view of property rights.