Lesson 1: A failure to recognize past failures dictates calls for more restrictive legislation.
Lesson 2: Politicians prefer grand gestures over measured policies.
Lesson 3: Long term and secondary consequences are rarely considered.
Lesson 2 fits with Uncle's definition that " 'Gun control' is what politicians do instead of something." And I'm going to borrow this from that part of the article:
Canadian lawmakers have failed to address the primary driver of gun
violence: gangs. Demands for gun control routinely displace calls for
measured policies that target this problem.
Ignoring the dangers of gang violence, the demand for a national gun ban is matched only by the push for lowering judicial sanctions for violent crimes. Still, the gun ban’s popularity remains high as political half-measures are designed to placate voters rather than protect them.