I don't think you have to be a jerk to esablish dominance. Being authoritative does not translate to being a jerk. In fact, I think the 'good ones' are able to be 'polite' and 'authoritative' at the same time. I recall getting a speeding ticket a few yrs ago and the trooper was nothing but polite...business-like, but polite. The only speeding ticket I ever got, unless you count the one I got in Canada - but I don't, since they go by km/h. LOL.