This is an interesting topic and you can answer it in many ways.With a topic like this, the problem is narrowing things down. One of the easiest things to do is to argue against it. In this way, you can argue that individual morality counts. In order to make this thesis work, you will need to give a few examples of where individuals made a difference.
This should not be hard to do. For example, you can use the life Jesus. One person started a movement, which changed the world. If you want to go with a modern person, you can talk about Gandhi. His non-violence inspired the world. If you want to talk about someone in America, how about Martin Luther King Jr.? He give strength to the civil rights movement and now we have a black President.
Your conclusion can be: at times individuals matter immensely! They make all the difference.