Short answer: no!
Those doing those deeds holds all responsibility.
The notion is insulting to all those who've seen those movies, played those games, lived in this culture and HAVEN'T turned into a callous homicidal maniac.
This x over 9000.
The human brain is capable of so many things, being able to tell between fantasy and reality is one of them. I've played video games for hours upon hours, when I got done I didn't have any desire to commit the acts of the game I was just playing. Same with a movie, I just watched this awesome action movie, and it doesn't make me immitate the movie. All these things are a world of fantasy, not real, make believe, etc. If you can't tell the difference between reality and a game or movie, you probably shouldn't be interacting with these things in the first place.
The fact of the matter is, in this social media world, internet, tv and all that jazz, exposes us more to the bad things that happen in the world more than they did a couple decades ago. Look at news programs, they are out for shock factor, so they will show you things that make you angry, sad, or vengeful. I stopped really watching the news a long time ago, because when I did, all I found was anger and sadness.
A good for instance, look at the Batman shootings recently. How many of these theater incidents have nearly occured now. The day after you have a guy planning to go to a theater with an arsenal. A couple weekends ago, a guy came to our local theater, carrying a satchel with a glock, 3 clips, over 50 rounds and 2 knives. He took a tactical position in the theater planning to do something. Fortunately, he was noticed before the theater started seating, and a potential crisis was averted. You know what, I was at that theater that same weekend. If anything, people come out of the woodwork when bad things happen. It's quite scarey to say the least.
So, I have zero belief that video games or movies create killers. It is what the killers "want" you to think, that is how they get off the hook.