WRT to not caring about the Knox case, I think the reason I don't care is the fact that I don't have the cognitive facilities to care about everything I feel like I should care about.

That being the case, I don't see anything wrong with using things that I do care about as filters to bring things to the fore for me to care about.

For example, I care about various home-brew energy solutions for poor people in developing countries because those things are related to other things that I already care about and am interested in.

The Knox case, as far as I can tell, barely brushes things that I'm already interested in. It may be a very big injustice, but there's lots of those.