Are gamers addicts? Do games make you more violent?

The World Health Organization added gaming disorder to its list of diseases. I think this was a good step towards helping people whose life was basically destroyed by something that's, for most, is a hobby or even a passion. On a similar note, are we affected by games, at all? Was your mum right not letting you play GTA, because you'll be more inclined to kill people in real life? It doesn't really look like it.