My reading of Camus suggested Meursault is not really a psychopath, alone. The second half of the book - the trial - can be read as a trial of the segregated colonial society Meursault finds himself in. His outrageous act of killing a total stranger was no different from what was going on around him (I think there may even be a line to that effect). That situation on trial in the book is actually similar to the Israeli occupation of Palestine. Any Israeli, if they so choose, can play God and take the life of a Palestinian with total ease, and unlike Meursault, get away with it.