Without this world we cannot attain enlightenment. There would be no journey. So in a sense all the things taking place around the world, all the irritations and all the problems, are crucial. In other words, we could say that if there is no noise outside during our sitting practice, we cannot develop mindfulness. If we do not have aches and pains in our body, we cannot attain mindfulness; we cannot actually meditate. If everything were lovey-dovey, there would be nothing to work with. Without others and the challenges they present, we would have no chance at all to develop beyond ego. So the idea here is to feel grateful that others are presenting us with tremendous obstacles. Without them, we could not follow the path at all.
From "Transformation of Bad Circumstances," in Training the Mind and Cultivating Loving-Kindness, compiled from pages 48-50 of the Shambhala Classic Edition.