So, in other words, it doesn't quite have more to do with what affects you as you claim in your earlier comment, but it has to do with what is accessible and available? Or some linear combination of the two?
I think it has something to do primarily with things feeling like you can have an effect on them. Accessibility and policy both matter. This is something I'm still figuring out like everyone else, but I think pure disinterest and laziness is not good explanation in light of the energy that can be seen in other political campaigns throughout history, like the new deal.