Interesting points bro.
I'll keep this response simple.
How does the truth that all humans act only in self-interest help you?
And, one more thing...
This "self-interest" perspective I believe holds true for animals and simple creatures, probably most humans for that matter, but can't you fathom that some people have moved beyond self-interest?
Here's an extreme case: Some kid is about to get struck by a fast-moving car. I see this and recognize that he's about to die. I run onto the road and push him out of the way. I get killed.
Am I still acting out of self-interest? Or can you fathom that I see somebody in unnecessary danger, and assist them?
It is self interest based on ego preservation as well as the good feeling.
...this becomes your version of good because it is beneficial to you and your survival ie your self interest.
Can it not just be that I know(of have been taught) what is "right"? What if I do something because it's the 'right' think to do?
Perhaps someone could act out of the interest of his community, and not his own interest.
I think I know now where you are coming from, but I have yet to be convinced that people ONLY act upon their own interests instead of the interests of a community or other person.
As I stated above, personally I have the ability to do something for another person(s) because simply it's the 'right' thing to do. Do I get pleasure out of it? Well to answer that question, would you get pleasure from cleaning a clogged toilet?
I believe that in a community, people have the ability to act for a cause greater than themselves; to do something that serves no emotional or physical benefit to them so others may benefit.
As I stated in my last response, I don't think you or I have the right to question an individuals motives. Can you make a decision for somebody, that they are strictly self-motivated, when you don't even know them? I'd like to see where or what you are getting your information from regarding the inherent strict self-interest behavior of humans.
I've yet to be convinced that people are ONLY interested in the preservation of ego, and survival.
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I do understand what you mean about the truth setting you free, and in MOST cases I couldn't agree more, but in this instance... How does this supposed knowledge benefit your everyday life?