The abuse stuff here is underground, too. It isn't that you aren't seeing it because you are blind. You aren't seeing it because those folks aren't flaunting it. Back home, abused kids don't tell their neighbors or their grandparents, because they don't want to get their parents in trouble. Abused spouses either don't seek shelter becuase they think they deserve the treatment, or because they know they will be found and hurt worse (which, unfortunately happens a lot!). You don't see it here as much as it happens because it isn't flaunted here, either.

Just keep reminding them, any time the subject comes up, that beating people up, whether related or not, really isn't acceptable behaviour. It won't change overnight/ Be the agent for change, so that down the road such things happen far less, and are condemned more when they do happen.