“Imposition of the death penalty is arbitrary and capricious. Decision of who will live and who will die for his crime turns less on the nature of the offense and the incorrigibility of the offender and more on inappropriate and indefensible considerations: the political and personal inclinations of prosecutors; the defendant's wealth, race and intellect; the race and economic status of the victim; the quality of the defendant's counsel; and the resources allocated to defense lawyers.”
