I would agree with you there...gun culture in the US predates any president in my lifetime.
For this one, I think I'd want to see more specifics on the data source they're using.
While I'm in favor of some gun control measures, the AWB seemed more like it was capitalizing on (and taking credit for) a trend that was already on a downward trajectory.
The homicide rates
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Even when looking strictly at the mass shooting rates
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It didn't really start to go through the roof until closer to 2016 (twelve years after the expiration of the AWB)
It's also fair to point out that different organizations have used different definitions of "mass shooting" over the years, and I think that makes it easy for people to "make data that matches their narrative" so to speak.
So if the "3 or more people being killed at one time in a public place" standard wasn't established until 2013 and prior to that it was a different set of criteria being used to define such a scenario, it makes sense that there would be more incidents reported meeting that criteria.
For example, the graph above only shows one mass shooting for 2001 (and zero for 2002).
However, by 2013+ standards, there would've been much more.
For instance, 2001 had 6 active shooter incidents that involved 43 casualties collectively
For 2002, there were 4 active shooter incidents that involved 29 casualties
While it may seem like splitting hairs differentiating between 3+ victims and 4+ victims, it is a worthwhile distinction to note in order to get a better feel for if a policy is actually working.
When you look at the numbers for incidents involving 3 or more victims:
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It didn't really differ all that much when looking at pre, during, and post AWB
Certain publications also get even more creative with how they define it.
“Mother Jones has a much more narrow definition,” said Hemenway. The group maintains a database of every “mass shooting” since 2012, “[which it defines as] four people being killed, but it has to be in a public place and it can’t be a gang shooting or intimate partner violence.”
A definitive answer to how many mass shootings there have been is difficult because organizations tracking such shootings use different methodologies.
www.poynter.org