It's because we can put a finger on the cause - we can point to the responsible individual and we know how to eliminate a significant percentage of those deaths if we could find a way to accept the trade-off of some aspect of gun ownership. Gun deaths are such a hot topic because we are able to make a reduction in the undeserved deaths with action. People ARE trying desperately to find a cancer cure, stroke cure, Alzheimers cure....they're getting support, aid, money...nobody is standing there with a cancer cure while somebody else screams at them about their rights to have cancer. The reality of most of the other deaths you listed is that any solution to those is still largely a scary random shot in the dark (pun unintentional) that might or might not work. A solution is unknown. Guns? Keeping guns out of the hands of people likely to murder with them? Researching and investing in ways to prevent needless deaths at the hands of an **** with a gun? yeah...even the table won't survive that conversation about how to get started.

Automotive accident deaths are probably the most comparable scenario - limits on driving require a balance of acceptable limits on speed and maneuvering to the ability of the technology to maintain it safely vs. the convenience and economical considerations of getting to where you need to go in a reasonable time frame and with a reasonable amount of risk. If we all drove at 5mph everywhere, those death by accidents would probably be almost nothing...but that's not very practical. Neither is allowing everyone to drive at 120mph and accepting a huge increase in accidental deaths. Collectively (and through elected leadership) we basically come to an agreement on how many automotive accident deaths are worth the tradeoff in the convenience and economical benefits related to speed and other limits. You can absolutely look at gun technology in the same way. However, it's such an emotionally charged and irrational issue that we can't even start to talk about HOW many deaths from a gun, or type of gun, are acceptable.

BTW, Trump just made it easier for mentally unstable people to own a gun two days ago by reversing a rule that Obama had put in place to tie government disability support for mental conditions be an item that would show up on a background check to own a firearm. (that one was signed without media photos and in the background of a lot of other publicized noise on other topics)