Yes, Sandy Hook was a terrible, horrific tragedy.
The government has many gun laws that are not enforced and, in fact, the government is guilty of violating those same laws (allowing straw purchases to occur and giving guns to Mexican criminals.)
It is a felony for a person to even apply to purchase a gun if they are prohibited from owning one. How many of those that have done this have been sent to prison? How many felons have been found in possession of a firearm and been prosecuted by the federal government?
The government does not enforce current gun laws, current environmental laws or immigration laws, but they think more laws are the answer?