The Tragedy in Newton, Ct

Why did he have to kill small children?  It so sad that there have been so many mass killings in recent years.  There is a list of mass killings in the United States since Columbine in 1999 at http://www.newsmax.com/US/mass-shootings-us-colorado/2012/07/20/id/445971  .It is so sad that too many mentally deranged people carry guns.  Can changing the gun laws prevent similar tragedies?

All I can say that I send my condolences to the family and friends of those who perished in this senseless tragedy.