Can you link the other topic? (I'm curious) And yeah, if that's what you mean by true AI then we definitely already have it. As for modeling human behavior, we're still a long way off. There are several algorithms that are designed with natural phenomena in mind, like Q-learning, artificial neural networks, genetic algorithms, bird-swarm optimization, etc. It's important to remember, though, that they're models. And if you think a model is ever going to perfectly model reality, then I would disagree with you and think that you're quite naive.