Diminished capacity?
Uh... no. Did you see the video? He was clearly in full control the whole time. Well planned and organized stunt. Warning saw horses, day glo vest, and hard hat, plus his own personal videographer.
The deranged can be very clever and obsessive but you could very well be right and I could be totally wrong. I think he should be examined for mental problems by the court at least to find out.