I don't think people differ in their ability to be logical and objective. Some people may have faster CPU, more RAM/HDD, but that's just the speed in which people do things. They don't differ in their ability to be able to perform fundamental, elementary operations (basically pure logic), which allow them to perform more complex operations. If people differ in their thinking, then that has more to do with software. Basically there's a computer hardware, and you can install virtually any kind of OSes and software on it. There's no limit as to what can be potentially installed, if there's no limit to memory.
I think emotions are more software than hardware.
I think there are differences between men and women, but I think that has more to do with differences between psychological masculine/feminine. For example, gay men are more similar in their psychology to straight women. There are some structural differences in the brain, but I still think that's more software than hardware.
Sure it "explains" things... by saying that what has been observed in the past will repeat again in the future. So you might say that a certain behavior is explained by Alpha Ti. But what that's really saying is that "Alpha Ti" behavior has been observed before, and it has been observed again now. So it's saying that the current behavior "fits" the past behavior, and this is supposed to "confirm" the past observation. Sure, but that doesn't explain anything.