(Laughing) Poor Hassle! We haven't even introduced the character, and you're already planning his demise!
I was thinking about the conversion process from human into Android. The entire procedure, from chip implant through skeletal replacement, would probably be done without any sort of painkillers or anesthetic, and that would be part of the reason why their memories are erased. The Androids could not function as intended after such trauma. Otherwise, the robots would simply install the controlling chip and not give a damn about how their slaves 'felt' about what they were being made to do.