Is anyone else sick of the mentally ill excuse given to the VT KILLER?

yeah, you know what.. I was just thinking about that the other day . I was watching some program and they consulted a psychiatrist, who by the way never treated him, and she was trying to say damage to the frontal lobe is seen in people that commit these crimes. then another channel was trying to say all this mental illness stuff.. It's like they are really reaching to find out why and blame it on mental illness. He may have had some issues mentally, but I am sure he knew exactly what he was doing, it was not like he was so mentally ill that he could not function in society or that he just snapped...this is something he seemed to be planning for a while. I hate to say this but some people do crime because they want to