If you could teach, let's say, three things (concepts, techniques, principles, whatever) during a two month beginner's class, what would you teach?
provided I don't teach, nor I could:
1) Violence: in a real fight you will meet it
2) Brutality: they will face you ruthlessly
3) Disonhourability: they won't give a damn
To the few who are still there I'd say: Manage those - with Aikido. If your Aikido can manage those, you can truly afford being peaceful.