Where do mind programs come from?

Where do mind programs come from?
Why people behave the way they do?

I once saw a documentary film in which two sides argued about whether human behavior comes from genes or is shaped by the environment. I was very surprised by it. How can someone believe that human behavior is determined by just one factor? How can someone discard all other factors?
Fortunately, many people accept the idea, that both genes and environment influence human behavior.

The way I see it, there are many factors that influence how we behave. Probably much more than just those two.
From an algorithmic perspective, mind programs don't come out of nowhere. Of course, some simple behaviors, some simple patterns can be a result of a random factor like a genetic mutation or some trauma. But some people show very complex and sophisticated behavior, which is very different from their parents' behavior and very different from anything in this culture, so they didn't learn this behavior from movies, etc. Science ignores it as statistically insignificant. But it's very naive to believe for example, that a person with a very specific and very developed strategy for cooperation is just a random phenomenon. I mean, it is normal that your computer can get a little buggy and it starts to report some errors, but you don't expect it to spontaneously develop a new advanced application. This strategy must have evolved in some environment, probably many individuals have been developing it for a very long time. Because there's not much cooperation here on Earth, it might suggest, that this individual learned this way of cooperation somewhere else. It leads to the conclusion, that besides genes and environment there is something like a soul, that has some experiences prior to this life and it influences this person's behavior.
But there can be many more factors, which influence people's behavior.