By banning it, the government would show people it's wrong and we would cut down the number of children killed by a large margin.
You've almost got it. By having any official policy that leads to the conclusion that abortion is wrong, you're causing the consciences of those that have ALREADY BEEN INVOLVED IN ABORTIONS to bother them.
Romans 2:15
since they show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts now accusing, now even defending them.
"I wish that you were hot or cold. The lukewarm I will vomit from my mouth!" - Jesus Christ