Behaviorists believe human nature has needs that must be met before it realizes its potential. Without these needs being met, people are dysfunctional. Libertarianism does not offer to meet basic human needs for anyone other than to say "someone else" will do it.
OK, you're going to have to explain that one in more detail. I
think I know where you're coming from with that, but I want to be sure.
I don't know how much detail you want. That's what Universities are for. Well just look at all the marvelous technological development that came from feudalism. Basically nothing other that sharper sticks and throwing bigger stones. Even before Maslow, Jesus and others said we are our brother's keeper. Since the 1940s when we established social safety nets, Europe and America have created a technological explosion. We make nuclear power instead of just nuclear bombs. We make moon rockets instead of just missiles. If America, Europe and USSR decided to punish Germany by genocide, they would have reverted to their monarchic roots. Instead they rebuild Germany, well mostly. If America had rebuilt Afghanistan in the 1990s, there would be much more progress there.
How would a Libertarian country deal with being in the middle of global conflict?
None of that even touched the original statement. I'll answer your question, but I'd appreciate an explanation of what basic needs need to be met, and how libertarianism doesn't offer to meet them.
Now, as to your question, I assume by "in the middle of", you mean in a position similar to Switzerland during WWII. And, in my opinion, it would be handled much like it was by Switzerland. Free trade with whomever came peacefully, and armed resistance to any who came in aggression.
Switzerland was in no position to take sides even if they wanted to. Bad example. What if England chose to remain neutral in WWII?
To answer your scholastic question about the needs of human nature I'll refer to Maslow since he is the simplest to argue. As long as physiological, safety, interpersonal, and esteem needs are met, people will thrive. It should be our goal to create a community that fosters these to the best of our ability. The rewards for doing so will be ever improving technology.