First of all, you understand that the population of Chicago alone is like a third of the population of the entire state of Indiana, less than a half hour away, right? You don't think that maybe a city of 2.7 million people will inevitably have more crimes than some rural town with a gun show? Moreover, there still are mass shootings in smaller towns too, it's not like only major cities have them, not to mention that "gun laws" are absolutely not the only, or even most significant, factor of general crime. It's simply a fact that if strict laws apply to one place, and not another, then people can and will go to that other place to do those things, which is why we need national laws for these things...