Helicopters dropping dumb bombs can be precise under the right circumstances.
The pioneer for this air maneuver was lebanon which used this tactics against an islamist uprising in a palestinian refugree camp. And here is how it works and why others often can not be compared:
The chopper does move slowly, uses gps to get into position and drops weighted smoke grenades for visual confirmation of the drop location before dropping the dump bomb. The lebanese military did some surprisingly precise hits this way.
How to reliable MISS the target: Move fast, aim less — thats the way the SAA handles things right now. How does the iraqi army do things? Time will tell.