Final answer:
There is no clear evidence linking waiting periods for gun purchases with murder rates, despite public misconceptions. Crime rates, including violent crimes, have decreased since the 1990s. Public policy and perception of crime are complex matters with many contributing factors.
Step-by-step explanation:
According to research and statements by David Lampo and other sources like the Pew Research Social & Demographic Trends, there is no definitive evidence to suggest that waiting periods for gun purchases correlate with murder rates. Studies have shown a decrease in violent crimes, including gun homicides, since the early 1990s.
Public perception, however, often incorrectly assumes that crime rates are on the rise. It is important to consider a range of factors and policies, such as background checks and other restrictions, when evaluating their impact on crime rates. The relationship between crime trends, public perception, and government policy is complex, with no straightforward correlation between specific laws or regulations and homicide rates.