If I was attempting to inform someone that they should care about the current situation, how can I best do that?
The facile answer is, "Via logic and evidence", for we know of no more reliable means by which to demonstrate the accuracy of a claim.
Unfortunately, logic and evidence are for some not only insufficient, but somehow misguided, or illusory.
Contrary to what I've long believed; ie. that we have no choice as to what we believe - that we are either convinced of something or we are not - some people do in fact choose what to believe, probably due at least in part to some manifestation of cognitive ease, cognitive bias and/or the Illusory Truth Effect.
Persuading people who want to believe in something other than that about which you are trying to persuade them can prove a very difficult and even counterproductive task.
The power of the cognitive ease effect can be so powerful as to render some people actively opposed to encountering contrary evidence. I sent my friend a link a to a website outlining logical fallacies, and he refuses to look at it, possibly because he senses that it might render his current beliefs far more difficult to justify.
So... how to go about persuading such people? Some methods are more likely to be effective than others, but as we have learnt from addiction, some people simply will not change until they have undergone some kind of change inside themselves which earnestly seeks new information or a new mode of living.
One thing is clear. Trying to force opinion and information onto others is unlikely to work, or is at least unreliable. Perhaps the best we can do in such situations is ask questions rather than to assert answers. By asking questions which promote critical thought, we can sometimes create the potential for change to arise from within.
EDIT: These issues are not relevant only to relatively uncritical thinkers. As the links describe, we all fall prey to these cognitive errors to some degree, even when we're relatively conscious of their influence.