After hearing from the demigods the real situation, Lord Brahma was very much concerned because the demons were unnecessarily so powerful. When demons become powerful, the entire world is placed in an awkward position because demons are simply interested in their own sense gratification and not in the welfare of the world. Demigods or devotees, however, are concerned with the welfare of all living beings. Srila Rupa Gosvami, for example, left his ministership and went to Vrndavana for the benefit of the entire world (lokanam hita-karinau). This is the nature of a saintly person or demigod. Even impersonalists think of the welfare of all people. Thus Brahma was very much concerned at seeing the demons in power.