As quoted at TheTruthAboutGuns:
“I had a teacher in college who used to ask, Who discovered America? He would offer some choices. They were Amerigo Vespucci, Christopher Columbus or the Nina, the Pinta and the Santa Maria. The answer he wanted was the three ships with which eventually someone would have discovered the New World and without which everyone would have remained in Spain.
“It is no different with the tragedy in Tucson…”