Ryujin
Legend
I am not sure that he understood that as child, to be honest.
That's left rather ambiguous but the feel that I got from it was as I stated; that he convinced himself that his parents performed evil experiments on him. It makes it easier to support the inner narrative that none of it is his fault, just as he claims to have never killed anyone. It's one big denial of reality.
After 5 episodes, I'm wondering if this show will be able have a good second season. The show is good because it focuses on JJ's trauma and her relationship to Kilgrave. Take that away and I'm not sure what we have. Would it be more up beat? As engaging if the BBEG of the second season isn't as personal for her?
I'm wondering if the intent is to continue with a second season? They've started introducing less power characters like Daredevil and Jessica Jones, and while DD is getting a second season, they might well be just effectively introducing such 'lesser' characters to the public. They could well be creating an ongoing narrative to cover the rest of the Marvel Universe, without betting the farm on any single property.