Your arguments would make more sense if a parent's decision to lock their baby in the car resulted in the death of 27 people.
<quote>Why don't we try to help the nutters before they kill our children?</quote>
Because in practice it is is much harder to control a person's will, mental state and 20-year upbringing than it is to control the guns and ammunition that he has access to.
<quote>Since alcohol doesn't benefit society, should we bring back prohibition for the safety of the children?</quote>
No, a gun with a 9 bullet clip has the potential to cause much more damage than a drunk driver.
If gun fanatics are so intent on having guns, then we should simply restrict ammunition sales and only permit gun clips that hold 1 bullet.