Eye for an Eye Is Human, But Is It Just?
NYC column discusses capital punishment for mentally retarded using as example, Craig Godineaux, who, with John Taylor, are charged with killing five people and injured two others in Wendy's murders in Queens; Godineaux's lawyer argues that he is not subject to death penalty because he is mentally retarded; Texas has no such constraints to death penalty, and suggests New York's policy is more humane (M)