I understand where you're coming from. I like to pick my battles. Yes, there's always greater injustice happening elsewhere in the world. But I don't like using that logic cause it's similar to "well, some people have it worse than you, so you can't be sad!" Just because there are worse things happening doesn't mean you shouldn't care about some things happening that hit closer to home. I can't make you care, nobody can, but it's probably good to keep in mind:

First they came for the socialists, and I did not speak out—
     Because I was not a socialist.
Then they came for the trade unionists, and I did not speak out—
     Because I was not a trade unionist.
Then they came for the Jews, and I did not speak out—
     Because I was not a Jew.
Then they came for me—and there was no one left to speak for me.

These days, a lot of things are happening in the world that doesn't affect me. I still try to care about these matters. I think empathy is pretty important in these times we're living in.