Simply put, homicide can be constructed to include suicides as well as accidental deaths. While these are issues with guns, they aren't the same issue as murder and should be treated differently (consider how often you see "pool related homicides" when discussing accidental drownings of children). Even if one was going to include them, then they should be clear when they are using terminology that is not only often misunderstood by readers but which has been knowingly used by others to mislead.

This is not to say that these other issues should be ignored. Having a gun in the home is more likely to make a suicide attempt result in death and that is an issue that should be discussed and dealt with. But it should be done so openly and recognizing it is a separate, though related, issue.