Surely,if you are an arsehole (however you choose to spell it), you can't go in for communicating face to face, by definition?

Mrs "Do As You Would Be Done By" is in The Water Babies by Charles Kingsley.

There's no contradiction between that as a philosophy and dealing with people who are operating on "do unto others what ever you feel like". If I pulled a knife on someone, maybe because I was out of my my head I would want to be stopped from causing any harm, in whatever way was needed.