Suppose a Seung-Hui Cho, Jared Lee Loughner, James Eagan Holmes or an Adam Lanza shot and killed or seriously wounded any of the families of John Roberts, Antonin Scalia, Anthony Kennedy, Clarence Thomas and Samuel Alito. Would any of them have given different opinions in their 2008 and 2010 decisions?

Virginia Tech student Seung-Hui Cho, 20, shot and killed 32 people and wounded 17 before killing himself, on April 16, 2007. Cho's weapons: a German-made Walther P22 semiautomatic pistol and an Austrian-made Glock 19 semiautomatic pistol.

Jared Lee Loughner, a 22-year-old student, shot and killed 6 people and wounded 14, at a congresswoman's public meeting with her constituents near a supermarket in Tucson, Arizona, on Jan. 8, 2011. Loughner's weapon: a Glock semiautomatic pistol.