It's not that hard an argument -- there have been probably hundreds of studies on the influence of media on people's opinions and resulting actions. Why do you think advertising is a nearly half-trillion dollar industry worldwide? It's a significant chunk of GDP in the US and UK, for example, and not without reason: advertising through various media consistently makes a measurable impact on the buying patterns of consumers, and it's not exactly a huge leap to apply this to politics[0].
That point aside, I appreciate the insight, and I think you're on the right track as far as thinking about how to make the issues more concrete to people in a personal way.
The other, perhaps over-broad human nature question is how to get people care about this shit even if it truly only affects "others" - people of other countries, other social classes, other races and other religions. There are middle-aged, upper class voting people, white ones even, who care deeply that their government detains and tortures mulsim men in secret and not-so-secret prisons without trial, who care if activists are targeted for intimidation or treated similarly to terrorists, who can look at history and see that pervasive surveillance without meaningful oversight is always, always abused at some point and who aren't so scared of terrorism that they vote all their own rights away in order to feel safe. That is a much harder battle.
[0] http://adage.com/article/moy-2008/obama-wins-ad-age-s-market...