Four reasons why playing computergames could turn you into an aggressor

I know, it suprised me just as much as it scared the hell out of me. Strange, because here we are, thinking that computer games are as much part of today's life as, let's say, mobile phones. However, Malamuth, Linz & Yao (2005) argue that certain features of the internet that contribute to aggression.

First of all, they argue that because video games are highly active, the players 'become' the aggressive characters, since they are required to take on the identity of a violent player. Next, it is stated that the video game player is directly reinforced for aggressing by the effects of the videogame (verpal praise, receiving points and visual/auditorial effects). Thirdly,  the frequency of violence shown is almost continous, and the scenes of gory death evoke excitement. Finally, video games are becoming more realistic.

Because of these four elements, playing violent video games is expected to be more harmful than violent TV programs and films. Now, what I really want to know is: do you think these scientists are right? Or are these just a bunch of traditional folks who do not have a clue about new media?