>I thought he was playing the part to trick them. I like that
>it was ambiguous whether or not he regressed and I personally
>like it better that he chooses to get lobotomized.

The way I interpreted it at the end is that he knew he had killed his wife, but that he'd rather be lobotomized than live with that memory and the memory that his wife killed their three kids.

I also think he was crazy the entire time before that.