[Memory manipulation is about that simple, yes... And there is one thing he's holding back, but for reasons of his own--and if he didn't, the whole thing would be blown.]

Oh, rest assured that any lasting damage was worked out centuries ago with the first several iterations of the technology. You are, and always have been, perfectly safe. The only way you will turn into a vegetable is if I make you one myself--and I have no plans to do so. How boring.