That's all very well and fine for things which we can reduce to survival.
Your 'rape' and 'murder' ideas are plausible, but no offense, plausibility does not rise to the level of evidence. The whole problem lies in your phrase:
"Fast forward a ways."
You are taking HOW WE ARE NOW and pretending that BEFORE we had intellect we could rationalize things in that way. Before we had that ability, it seems evident that the 'Alpha Dog' model would have carried the day. Wolves have alpha dogs. Gorillas have 'alpha' dogs. Lions have 'alpha' dogs. This is just wishful thinking on your part, and I don't feel compelled to accept wishful thinking as a substitute for an explanation.
Now, as I said, even within that framework, the solution is only addressed in regards to survival and reproduction. We have choices that have nothing to do with either survival and reproduction and everything to do with pure preferences.
These 'pure preferences' go beyond physical disposition. Some people think a sunset beautiful and choose to watch them. Where is the connection between considering a sunset beautiful and our survival/reproduction traits that the theory says have built us? The theory built us but now it doesn't? Hello, can we say 'ad hoc'?
Some people think riding a bike is more pleasurable than roller blading. While it might be argued that both of these can be reduced to survival by the route of fitness, but the choice between the one or the other doesn't. I'd be interested in seeing the experiment that attempts to document the different evolutionarily physical traits and dispositions of people who do certain types of physical activities. This would be an obvious and straightforward prediction of the theory: all choice should be able to be tied back to survival/reproduction, since that's what drives evolution.
If anyone had any incentive to perform such experiments, it would be the fitness industry. For some reason, this hasn't occurred to them. I propose that it is because it would mean living as though evolution were true, which nobody actually does. And that's one of my challenges to evolution, especially in regards to the free will question, and to a large extent the 'moral choice' issue. If you only take your little 'evolution' theory out of the box when it suits your fancy, but otherwise keep it locked up, it makes me wonder whether or not there is really a big charade going on.
I tell you what, if I were an evolutionist, I would be openly scoffing you right now. For my own part, I'd be having sex with as many women as possible in an attempt to maximize the flow of my genes. That would be living as though evolution were true. I wouldn't be doing any raping, because that's not my bag. I wouldn't need to. But some men, who lack any mad charm skills like me, or are otherwise ugly as sin, would have to resort to raping because otherwise they'd have no chance of furthering their gene pool.