Child and adolescent psychiatrist Dr. Harold Koplewicz, president of the Child Mind Institute, told ET that this could have been a warning sign.
"These events, while horrific, are fortunately very rare," Dr. Koplewicz said. "When the online experience and the video games seem to be taking up more time than the real life world, that's the sign where parents should intervene and not only stop it but also reach out and figure out why their child is doing that."
For Dr. Drew Pinsky, the bulk of the blame lies with Elliot.
"The problem was him -- not the movies, not the world," said Dr. Drew. "But he was looking for solutions in these films and video games, and all those solutions are really a problem."
As Elliot publicly ranted about life not being fair because of his lack of attention from the opposite sex, Washington Post film critic Ann Hornaday pointed to movies like Neighbors as possible influences on Elliot.
"How many students watch outsized frat boy fantasies like Neighbors and feel, as Rodger did, unjustly shut out of college life that should be full of 'sex and fun and pleasure'?" Ann wrote.
Neighbors star Seth Rogen took exception to this comment, responding via Twitter.
"I find your article horribly insulting and misinformed," Seth wrote. "How dare you imply that me getting girls in movies caused a lunatic to go on a rampage."
Mom blogger Liza Long, whose son is bi-polar, has suggested Assisted Outpatient Treatment (or AOT) as a way of preventing these types of occurrences.
"[Elliot] wasn't taking his medication," said Liza. "Under an AOT law, that wouldn't be possible. He would have to take his medications to remain in the community."