I've played video games for a few decades now and I'll tell you for a FACT as each new generation of game comes out they are more violent, more graphic, the game play rewards more and more amoral actions and the people who say it has no influence are full of crap up to their brown eyes.
The industry responds to what the market wants and as kids grow up 'stabbing the hooker to death so I don't have to pay her', and getting bonus points for it, they start looking for something 'edgier' because stabbing the hooker is just the norm.
The original Texas Chainsaw Massacre was the most shocking, grotesque and graphically violent movie in history at the time of it's release. Now with all the slasher/torture/mutilation flicks kids are seeing Texas Chainsaw Massacre can be shown on public TV uncut!
How much do Super Bowl commercials cost?
Do you really think that people will pay tens if not hundreds of millions of dollars for 15-30 seconds of air time if it didn't affect and influence people?
How many of the lying hypocrites telling us that their movies, TV shows or songs don't affect anyone have gone on to tell us as they win some award how proud they are that their art and talent has influenced so many people?
The NRA didn't 'fail' and Wayne LaPierre didn't misspeak, he told the truth and even gun owners have hobby horses they are willing to blind themselves over.