There's really no way to know for sure what would have happened in this situation if other citizens had guns, but it's possible they could have limited some cas

There's really no way to know for sure what would have happened in this situation if other citizens had guns, but it's possible they could have limited some casualties. However, looser gun laws aren't such a simple issue. If you're considering the societal impact of gun proliferation, you have to weigh the pros and the cons. While there may be more people available to stop gunmen because of the access to guns, increased access to firearms increases the number of firearm related accidents. This is really something that comes with the territory. No matter how much gun safety is taught, there's always going to be a distribution of people who fall outside of safe usage of guns. At that point, you have to consider whether, as a nation, does the number of casualties based on this incident outweigh the potential number of casualties based on firearm related incidents caused by increased proliferation of guns?