The first time I talked with George Sodini in 1999, he said things that were mildly concerning to me because they didn't seem normal. He didn't come across as insane or anyone to consider dangerous. He seemed to be someone in need of a counselor or psychologist so I advised him to see one and talk over his issues with a professional.
He wanted to talk to me. I am not trained to help with that nor did I have a desire to get involved with his life beyond casual friends. I told him as much.
Sometimes George would start talking to me about his problems. I would inquire about him seeking professional help and it was always negative. I used that to inform him I am not a mental health professional and that is what he needed. Years later, as he threatened me, I finally suggested he get psychiatric help. He needed it.
Sometime after George committed his horrific acts, I learned he had demonstrated problems as young as 12 or 13. Problems may not be seen by all but some do see and call attention to them.
George was rational enough to get help, once told he needed it. He refused. I don't think he wanted to do the hard work as much as he wanted someone else to do it for him.