I have to say it tends to be generally less credible news sources that are doing this nowadays. This paper is a trashy tabloid with little to no respect in the UK. I noticed ITV also reported it like this. The way the BBC reported it was "why did a guy with clear and documented mental health issues have a f***ing gun?"
Of course there's always going to be a whipping boy for "the new thing". My dad had this reading comic books and listening to blues/jazz back in the 50's, now blues/jazz is considered posh & highbrow. The same went for theatre when that started. For now it's porn and video games, but I don't think it'll last long now.
Journalists can be the kind of horrible scavengers who constantly hope for a shooting or terrorist attack so they can get more viewers. They blame video games because they are trying to avoid the overwhelming scientific evidence that says that the biggest "other" influence for these events (the main one being a dreadful and probably quite mad person) is the media themselves. They give people like this a huge amount of publicity, which is exactly what the killer wants. The best example of that would be Anders Brehvik, remember him? he played their game, knowing he would get this exposure. They spent weeks reporting on his case and spread his message for him. Their get-out was claiming that it was all because he played WoW and CoD