It wasn't enough to take his parents away, and their memory. They couldn't risk him being found one day or attention being given to their bodies... So they implanted new memories, making him believe he killed his own parents, that they hated him for as long he could remember..... Putting much effort as possible that he would believe it  for years to come, unintentionally causing damage to his mind.

When he grew older he hallucinations, that slowly helped him piece together the truth appeared.... And when he realized it he ran towards the elevator with tears in his eyes wanting to rip them apart." You ripped away everything from me! Even what was real!"