(1) Self-defence is no responsibility, but a legitimate choice.
Inventing responsibilities which are none merely muddles the language and discourse.

(2) The video games bogeyman is but another example of the U.S. lagging behind Europe in society development by a decade or more. We've had this discussion long ago and for a long time. Fact is the video games haters have not been able to produce meaningful empirical analysis to back up their claims after complaining about video games for more than a decade. It's a classic bogeyman racket and by now most interested Europeans are aware of it.
(It's totally not surprisingly that the NRA picked it up as decoy to channel the outrage away from their pet guns.)

The 'violent video games are evil' racket is about as nonsensical and obsolete as the 'bio fuels' racket the Democrats are falling for.