There are people who are doing things. Perhaps they are not yet able to change the world, but they are changing their surroundings and societies at least. If nothing else they are bettering their families, and bringing up their children to be knowledgeable, upright and just. And perhaps it will be these very children who will be a part of the army of Jesus(Peace be Upon Him), who will succeed ultimately in ridding the world of the wrong doers.
We must not underestimate any good and efforts, and we must not lose hope. For whilst the changes and improvements may take time, or are small in number, or are not being publicized, they are happening.