Be careful with your critiques of Bono. His policy goals--succoring the poor through policy rather than through individual charity which affords the give the opportunity to imitate Our Father in Heaven who makes the rain fall on the just and unjust alike--are leftist, but he is hardly a socialist. He very much supports African development projects which institute small-scale capitalism (the only thing other than Christian charity that's ever worked to succor the poor, at least without introducing odd new social pathologies).
A matter of perspective, I suppose. "Leftist" and "socialist" are the same thing, to me.