Here in Australia, there's a simple common narrative: After the Port Arthur massacre in 1996 https://en.wikipedia.org/wiki/Port_Arthur_massacre_(Australia) we banned automatic weapons and required a "good reason" (not including self defense) for gun ownership. No mass shootings since. Everybody else, including the US, should do the same. Hilary, for example, used this message during her campaign.
But the US is very different from Oz wrt guns, and the message perhaps too simple to be useful.