Thoughts on why, in my opinion, Amortentia had nothing to do with Tom Riddle/Voldemort emotional predicament.
Throughout the books, we are shown over and over again how love is one of the most ancient powerful magic to ever exist.
Lily, is the best example of this statement. Her sacrifice alone was strong enough to repeal a killing curse from the most powerful warlock the wizarding world had met. Her love was so fierce that death itself was rebound, and if it weren't for his horrocruxes Voldemort would've truly died that night.
One of the many theories surrounding Tom Riddle, is that because of been conceived under the influence of amortentia he was incapable of feeling love. And to me that is completely wrong. Let me explain why.
If love is such massive source of magic, enough to defy death, ergo nature itself, how a human made potion could work against the power of love? It's true that Amortentia is the most efficient love potion, even though it does not generates real love, it's power cannot even stand a chance against the ancient magic of love.
In my opinion Tom Riddle's condition was purely psychiatric. Which I found ironic given his hate for all muggle related topics, and it adds an extra level to his character.
In the book The Half Blood Prince, especially through the memories of Dumbledore we can see some typical symptoms of someone who suffers from psycopathy (which is different from a sociopath). During his stage at the orphanage, Tom shows no empathy towards the people he hurts; and even though he probably started doing it because he was bullied in the first place, he had no guilty or remorse for his actions. I think that even he was proud of being able to generate such terror among the kids. His displays, comes from wanting to dominate his fellow kids, to make them see as superior, special. Is not about making them suffer for the pure joy of it, but for power. To show them their place. He collected objects from his victims, again for power, to let them know he could take whatever he wanted but also to remember what he had accomplished. It's also shown that he is aware when and how he can perform such acts without being discovered, in other words premeditation. His actions (especially before horrocruxes, which definitely twisted his already fragile mental stability), are calculated, controlled.
Contrary to sociopaths, Tom is able to adapt to society and follow it's rules. He is an excellent student, eager to learn, able to read and manipulate people building this way his path through his new life at hogwarts. Even before hogwarts it's hinted that he is very smart despite the horrible educational system from his orphanage. He knows what people wants, and he gives them exactly that. Like with Slughorn and his pineapple treats. During his last years he has successfully manipulated all students and teachers, with the exception of Dumbledore. He became the perfect golden boy, because he knew that that was what people expected from him. Of course this facade couldn't be always maintained, his interest in the Dark Arts is shown since the moment he gained access to the restricted area. And his arrogance and superiority complex bretrays him from time to time, like when he talks to Slughorn about horrocruxes and never considered that this could be a key factor in his downfall. Or his continued underestimating of his fellows death eaters (like Snape who he never thought would betray him despite having a level of occlumency that was s serious barrier against his legilemency) and even the abilities of Harry Potter.
Despite his good looks and no signs of physical deformities, Tom Riddle was the son of a woman who was a product of generations of incest. If Merope had not escaped, her destiny would have probably be one where she would've been forced to carry her brother's children.
So, in my opinion Amortentia had nothing to do with his personality, maybe it could be argued that it may have had some effects or even exaggerate his already existing problem; but again a love potion can't rival against real love. All of this of course, should also be analysed under the scope of growing up in an abusive environment, with no resources for a healthy growth, and a society who had just recovered from the Great Depression, and was now entering a new world war.
Voldemort was a the result of what he promoted, purebloods only, and what he hated the most, a muggle condition.
Life is a bitch that loves irony.
