I think gizmodo have caught onto an undercurrent of media hypocrisy regarding real-life violance and its association with computer games. If this murder had occured in 'connection' with a mature/violent video game, there would be a huge furore followed by baseless claims about cause-and-effect. The fact that this violence stemmed from a session of 'Farmville' of course completely undermines the 'violent games cause violent acts' hypothesis, hence the broader media and public are ignoring it.

Disclaimer: I've never played Farmville. I assume it's non-violent gameplay.