There are lots of reasons that some people hate guns, but in the real world, these are most often linked to hating the thing that people with guns can easily do, which is turning living people into non-living people. But in fiction, the gun-hater's reasons are often different. He just specifically dislikes guns. He has no problem whatsoever with other, less efficient means of turning living people into non-living people. Sometimes brought on by Executive Meddling or by the Media Watchdogs stooping over the cartoons, and may forego replacing guns by removing them altogether.