Good point and I think they're counting on us having a short memory. The media is designed to distract us from one immediate crisis to the next. It keeps us in a state of fear.
Then of course, people have their day-to-day lives to deal with and these major issues and injustices get lost in the shuffle. We think, "Maybe someone else will do something about it." Honestly, some people try, but they come up against a brick wall at one point or another and give up or are threatened/intimidated, etc., so the powers-that-be keep getting away with it.
Guess it comes back to raising one's own vibrations and creating peace, love, health, and balance in our own lives. I would like to think that we have powers far beyond what we realize.