Do not worry about anything. Weep with those who weep.
God does not worry, since he is in control, thus we need not worry, since he is good. God does weep for the wrongs of the world, indeed, he rights wrongs, because they displease him. Our reactions to the wrong of the world, then, ought to be sorrow, even anguish, because this is not how things ought to be.
To worry is to doubt the sovereignty of God. To not feel sorrow is to act as if it is not wrong. To feel glad is to act as if it is right. Rejoice in the Lord always, he is right. Weep for the evils of the world, with sorrow and even anguish, because those evils, those wrongs, speak against the glory of God, and rejoice, for God will set all things right, judging the evil and healing the broken. Glory be to God.