The Aurora shooting was a true tragedy. Sadly, all of the guns used in the massacre were purchased legally in the U.S. In Canada, we pride ourselves on being a peaceful and non-violent nation. For decades, Canadians have recognized the importance of remaining vigilant about gun control. But the passage of Bill C-19 -- and the abolishment of the long gun registry -- not only resulted in the loss of an important public safety tool, it also represented a step toward adopting more lenient gun control laws in Canada.