"I Never Thought He Would Do Something Like That..."

You know how it works. Someone shoots up a school/classroom/office building for no apparent reason, and police interview people who knew the person. They usually give variations on "he was the sweetest guy; I never would have imagined he could do this". So it was a total shock to read this in an AP story about a man who murdered seven residents and a nurse at a nursing home today:

Griffin said Stewart had once been a painter. She said she had no idea whether her ex-husband was somehow connected to the nursing home or why he would shoot people there.

"He did have some violent tendencies from time to time," Griffin said. "I wouldn't put it past him. I hate to say it, but it is true."

You wouldn't put it past him to go into a place reserved for sick octogenarians and kill them all?! What kind of a man is this?!