Ahh... I think I'll stay away from the Freudian analysis...
As much as I would perfer to discount them, like you, I have learned to listen to my dreams, especially recurring "types" like fighting ones.
Fighting dreams have always paralleled some kind of stress in my life. I don't have them as much as I did in my younger years. I like to believe that either there is less stress in my life these days or that I am more skilled in dealing with day to day conflicts. (Ha! I wish...)
We often talk about karate practice as a physical, mental and spiritual endeavor. I've never had much problem with the physical endeavor. Give me an opponent and I'll give it a go. Other type of conflicts/opponents of less physical variety, well it is frustrating as hell. Turn these into physical opponents in a dream, it becomes easier to deal with. To bad, we just can't go around beating everybody we have a problem with to the ground, eh...
More mental/spiritual development is needed to deal more skillfully with these latter types of conflict. In so much as one is able to handle these types of conflicts better, one is also able to perceive whether a physical response is needed in what may appear to be a physical confrontation.
Just thoughts from a less skilled fighter in the mental/spiritual realm.