Originally Posted by asking
Mutations are either both good and bad or neither depending on how you look at it. Basically, they are amoral. They are just changes. Whether they make an organism behave well or badly is in the eye of the beholder. Whether they make an organism more fit for its current environment or less fit depends on the current environment (and not future environment). So it makes no sense to say mutations are good, or bad.
Saying mutations are bad is like saying rain is always bad. But the opposite isn't true either.
As for bipedalism etc, large numbers of genes (and ALL genes are mutated) cause all those things, not single genes. There isn't ONE gene for such traits, or indeed most traits. Very few traits are single gene traits. In school students are only taught about really obvious deleterious recessives, but that doesn't mean that's all there is.
Anyway, there is endless evidence for behavioral traits like the ones you mention having a genetic basis. That DOESN'T mean that behavior is ALL genetic, I hasten to add. But it does mean that a proportion of personality and tendencies to behave in certain ways are inherited, in both humans and non human animals. That's why you can breed for gentleness in domestic animals or aggressiveness if you want something that fights or hunts. But those genes for behavior are often linked to other traits.
For example, when some researchers tried to domestic foxes being raised for their fur, they got foxes that were easier to deal with--more like dogs. BUT the foxes barked like dogs (and fox puppies), which adult foxes don't normally do AND the fox's fur was all different colors, like dogs'. So the fur was ruined by breeding for that puppy-like, eager to please trait. That's why it's much harder to find the exact set of genes for a given trait, because it's probably a whole bunch of genes, each of which does 10 different things. So in the wild, those puppylike behaviors are not "good" in an adult fox. But in the lab, they become "good," because we want them.