I think if you intend good health for someone (real or unreal) you do not imply ill health for all others. If your focus is on a specific individual they are the sole (or soul) recipient of your good will. Everyone else remains unaffected. You exclude all but your focus from the intention.
Now a little on the grander subjective business...
If there is only One Conciousness then there is only One Will. So there can never be conflict. We perceive it on a surface level, but if you look at all the subconcious meanderings of the mind it is easy to see the origins of conflict... within us.
Now I
think Steve's Subjective Reality model is pretty awesome, but not the full story. There are still some sticking points for me, like gravity and other physical laws. However, I believe that the more we intend and become aware of our desire or will the closer we get to universal will. If there is only one conciousness then greater self awareness reveals our (as in each of us united in universal will) real intentions. It's like a slow discovery that we're god and what we're actually up to. OH yeah, I forgot, neat...
So any conflicts in intention are created on an individual level be our lack of awareness...maybe.