peter tillers mgxlwrwvivfpverizonnet dear colleagues mark colyvan helen regan scott ferson recently asked crime belong reference class since question part directed decided try answer question please see wishes horses discursive comments attempts prevent individuals unfairly burdened reference classes httptillersnetwisheshtm preprint sincerely peter tillers wed 06 aug 2008 061618 0000 uai criminal classes