It really sounds like you're reading too much news. News is fear mongering most of the time. Try taking a short break, you might be surprised how much better you feel!
However, measles outbreaks and hate-crimes aren't going to stop because one does not pay attention to the news.
It seems more would be done if local news, or even just having a conversation with a friend were the primary way of obtaining information.
I would venture a guess that you're more likely to pursue a cause if it directly affects your community or someone you know and love thinks it's important, than you are just by reading something on the internet.