What you achieve is civilian casualties and no enemy KIA.
My first post could have used some more thought. Counter battery fire against this enemy is ineffective. Other assets will work better to kill those that shoot the mortars.
You are right, but I stick by my theory that mama Iraqi who does not want American mortars falling on her and her kids will keep an eye out in her neighborhood and chase away the bad guys with her broom if they do show up.
A very basic theory which applies to any culture: If mama's not happy, nobody's happy.
I think our restraint provides an environment which allows the insurgents to operate with impunity.