I do not think that aikido comes with any "moral obligations" attached to it. It is being a man that comes with "moral obligations" and I believe that these are the same for aikidoka and non-aikidoka alike. I do not think that one should look to aikido for a moral code. For me, aikido is simply a method of effectively dealing with conflict, not a philosophy of how to live my life. I do not feel that my responsibility to society has changed since starting aikido.
I expect aikido to improve my ability to handle conflict, not only physical conflict but also verbal conflict, personal conflict, etc., but that's pretty much as far as it goes for me...