

I don't think Atlas is a sociopath, according to the wikipedia he is more a "hollywood sociopath", the kind of the master of SPECTRE in James Bond (the one with the white Angora cat

Moreover a sociopath shows a lack of empathy towards others. I am sure that Atlas has empathy, otherwise what could be the plot to avenge himself from the humanity? He wants to hurt humanity, and it would be nonsense if he hadn't empathy to "feel" that. Moreover don't forget about Livian: he abviously loves her

Now I remember another thing about the Atlas of the 80s. I have seen the first full episodes only once and in Japanese, that explains why I easily forget about that.
The only people Atlas knew during his "childhood" was Guiss, Skunk and the Guiss' robot servant who looked like the first incarnation of Livian. At the end Guiss and Skunk deassembled the robot servant, putting Atlas in great despair. This could easily explain why Atlas has so much anger and hatred towards humanity (Guiss and Skunk) for destroying the only one if his kind, who was his friend (robot servant <-> Livian).