Do you mean that "moral" should mean "someone who cooperates with others" and "immoral" should mean "someone who does not cooperate with others"? Then "moral" and "immoral" would just mean "cooperative" and "uncooperative," which we already have words for. Plus, morality shouldn't require you to cooperate with immoral people (although whether you should actively punish them or not is the eigenJesus-eigenMoses question).