is there a difference between a campus shooting and a hospital bombing?

[MADem]

43. Apparently, there was--according to his mother.

http://www.nytimes.com/2015/10/03/us/chris-harper-mercer-umpqua-community-college-shooting.html?_r=0

After his parents divorced when he was about 16, he lived with his mother, Laurel Harper, a nurse who fiercely protected him from, among other things, the neighborhood sounds of loud children and barking dogs. Once, neighbors said, she went door to door with a petition to get the landlord to exterminate cockroaches in her apartment, saying they bothered her son.

“She said, ‘My son is dealing with some mental issues, and the roaches are really irritating him,’ ” Julia Winstead, 55, said. “She said they were going to go stay in a motel. Until that time, I didn’t know she had a son.”

He was listed as a 2009 graduate of the Switzer Learning Center in Torrance, a private school for students with learning disabilities, emotional issues and other special-education needs. Officials from the school declined to comment on Friday. Mr. Harper-Mercer joined the Army for a month in 2008 but was discharged before finishing basic training.

I would further submit that his familiarity with lithium would also be suggestive as to his issues:

Just this week, on Tuesday, using the handle lithium_love, he commented on a post titled “How many girlfriends have you had?” by saying “0. Never had anyone.” When pressed further by another user, he responded “Well, it means I’ve never been with anyone, no woman nor man (nor dog or animal or any other).” Then, on Wednesday, responding to a comment that he “must be saving himself for someone special,” he said, “Involuntarily so.” It was a day before the killings.

“He did not like his lot in life, and it seemed like nothing was going right for him,” a law enforcement official said, describing the writings found at the crime scene. “It’s clear he was in a very bad state of mind.”