Well, that's just my point. Over here guns are barely an issue, gun ownership largely a rural phenomenon with an overwhelmingly urbanised population, so all it takes is a few weeks of attention following a mass shooting to institute knee-jerk gun control (by the conservative government I should point out).
In the US, under the same circumstances, you get a similar short lived reaction, predominantly from elements of the urban, left-wing, and a MASSIVE concerted and ongoing reaction against that from the conservative right. Overwhelmingly so, to the point where gun laws were liberalised across the nation. Combine that with the election campaigning explicitly addressing gun ownership (unthinkable over here), the special interest groups, funding and lobbying, and it certainly appears that the American conservative right cares a whole lot more about gun ownership, as a political issue and an element of identity politics, than the American left cares about gun control.