I'm not addicted to gaming so I have no idea about what are you getting from, even violent video game doesn't worsen or aggressive my behavior because I know those are not real, they are for entertainment purpose.
ESRB is rating agency in North America only, not UK nor is Europe. The rating board in UK and Europe are run by government, since ESRB is self-regulated that all game publishers have to follow. Microsoft, Sony and Nintendo banned AO rated and unrated games from playing on game console, also Valve (Steam) banned those too.
