Although I do believe that it can be count as a mental disease, I don't think that a perfectly normal man can get highly addicted to a game, I think that this is added up to something else like people who are depressed or stressed or have actual mental sickness. The fact that people murder and steal for video games is just disgusting. As I noticed people are mostly getting addicted to specific and mostly popular games and there might be some sort of known or unknown specific thing that those games have in common.