Don't you wish things were always like they look in this picture? different people, different colors, all come together in harmonic combinations?
But the world is not like that, and for those who care, it might be very frustrating at times. For example, when opening the news and seeing a story about a 12 years old kid, shot by the police because he was playing with a toy gun, and knowing it can only happen in a certain kind of neighborhoods and knowing why.
And it is so frustrating because you can't do much but you can't just look the other way either.
So what can we do?
A friend of mine worked for several years as a flight attendant. He told me once about the training of cabin crews for emergency situations. He said that the greatest challenge in these situations is that you can't really do any of the two things that your instincts tell you to do. You can't run away, and you can't do much to solve the emergency either. The way this dilemma is faced by the airline companies is to assign each crew member a very specific responsibility, so in ( the very unlikely ) case of an emergency, everybody know exactly what they are doing. This policy proved itself many times for at least, making sure passengers and crew are more calmed down, and even sometimes saved lives by enabling a faster evacuation of the plane, etc.
The reason I tell you all this, is that I think its a good analogy for that "what can we do?" sentiment about discrimination.
Maybe there is really not much we can do about it globally, but there is always something we can do in our immediate context. First of all we can always ask ourselves what is our position on the subject? what are our personal challenges when it comes to how do each of us treats others? and then we can become ready to react properly in cases when there is something we can do.