Three things, Adam. First, you seem to have misread one of my comments. I wasn't saying firearm deaths were a "minor policy issue." I was saying that it is difficult enough to get bipartisan agreement on minor policy issues due to the partisanship in Washington, and darn near impossible on something as major and contentious as gun control. And honestly, this is just for standard legislation, which can be passed with a bare majority. Amending the Constitution, which requires a 2/3 vote in both houses, is simply not going to happen in general, and certainly not in the current environment.
Second, you speak like the U.S. is of one mind in all of this. We are bitterly divided on this and a whole host of other issues. These divisions make it difficult for either side to accomplish much on their own and hampers the ability to compromise or find common ground. This situation results in legislative gridlock, so nothing gets done. This makes it look like we don't care, when in fact we do. But our leaders just can't work together to find common ground on any of the major issues we face.
By the way, the idea you mention of "don't do anything to take away our rights" (which you refer to as belligerent) is actually a cornerstone of American culture. We view the rights enshrined in our Constitution as the only thing keeping us from slipping into an authoritarian dictatorship (like, for example, Turkey with Erdogan) and we rightly view the chipping away of any of those rights as a precursor to the end of our democracy. This is even more so with the right to bear arms, since history has shown that one of the first steps of authoritarian governments is to disarm its citizenry.
Finally, my comment "but you don't see us too concerned about it" was meant as sarcasm toward my own government. Many of us are absolutely angry and frustrated that we haven't been able to move to a system of Universal health care, and many of us are frustrated that we can't manage to enact some reasonable firearms regulation. But there is an inertia to a democratic government and the money and corruption in our government make it impossible to make any real changes, or even to examine the issues in a reasonable fact-based manner. Heck, a large segment of our country are "flat-earthers" when it comes to climate change, ignoring the overwhelming evidence staring them in the face.