The parents would say that had their child been able to conceal and carry a weapon the only death would have been the shooter's.
Gun Control has 3 main problems:
1. Outlawing guns results in only criminals owning guns. These are people that obviously have no problem with breaking the law to obtain their weapon in the first place, whats to stop them from using their illegal weapon?
2. Legaly purchased firearms account for a small fraction of shooting related injurys, deaths, and accidents. Illegally obtained weapons far outnumber the legal weapon related incidents.
3. Owning a gun for protection is like a country with nuclear weapons. You will not use it unless you have to, and everyone else, even those with nuclear weapons themselves will go out of their way to avoid using them in fear of the consequences.