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No, you don't. A perfect rationalist is not a sociopath because a perfect rationalist understands what they are, and by scientific inquiry can constantly update and align themselves with reality. If every single person was a perfect rationalist then the world would be a utopia, in the sense that extreme poverty would instantly be eliminated. You're assuming that a perfect rationalist cannot see through the illusion of self and identity, and update its beliefs by understanding neuroscience and evolutionary biology. Complete opposite, they will be seen as philanthropic, altruistic and selfless.
The reason why you think so is because of straw Vulcan, your own attachment to your self and identity, and your own projections onto the world. I have talked about your behavior previously in one of my posts. do you agree? I also gave you suggestions on how to improve, by meditating, for example. http://lesswrong.com/lw/5h9/meditation_insight_and_rationality_part_1_of_3/
In another example, as you and many in society seem to have a fetish for sociopaths, yes you'll be a sociopath, but not for yourself, for the world. By recognizing your neural activity includes your environment and that they are not separate, that all of us evolved from stardust, and practicing for example meditation or utilizing psychotropic substances, your "Identity" "I" "self" becomes more aligned, and thus what your actions are directed to. That's called Effective Altruism. (emotions aside, selflessness speaks louder in actions!)
Edit: You changed your post after I replied to you.
Still apply. Doesn't matter.
If I remember correctly username2 is a shared account, so the person are talking to now might not be whom you have had previously conversed with. Just thought you should know because I don't want you to mistake the account with a static person.