This is a really interesting discussion, one I have given significant thought to on my own time, and I have never heard of this guy who thought of this philosophy. The way I started thinking about this whole "emotions are a means for survival" thing is depression pills. When people are feeling depressed they can take a pill that balances the chemicals in their brain properly and they feel better. I thought about this and I guess read somewhere I don't remember where about what other people thought about the subject. It is really depressing if you think too much about it, basically it denotes that the purpose of life is to survive and reproduce, none of our ideas about good and evil would matter. I personally choose not to think in this manner purely because it is too depressing. I know science might prove me wrong but it is a choice I make, sort of a choice for ignorance. Another point is even if this chemical theory is true it makes no difference at all people are still going to do whatever they feel like doing, as Nietsche so aptly demonstrated.
Also I believe I can justify greed in terms of this theory. Greed is the wanting of something, the more you have the easier it will be for you to survive. That was a pretty general statement but if someone comes up with something I can put it in terms of what I said. I would also like to respond to this post by zlo:
There'd be no reason to care about (or for) the person if he/she becomes temporarily or permanently unable to reproduce, and such things as faithfulness or devotion would be absolutely unacceptable (in fact, you wouldn't even be able to understand what it is)
There is all the reason to care about the person, you are supposed to protect them and help them survive that is devotion. The understanding what devotion is comes with sentience, we as sentient beings are able to think about these things. Anyway as I said before, while all this may be true, I choose to ignore it because this theory will not affect us in any way. People will still do what they want to do.
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