Earlier quoted context omitted.
None of those were designed to efficiently kill people like me. The OP's point is that I should be worrying more about handguns, and he's right - but that doesn't mean I can't worry about other things designed to pose a threat to my person too.
As the quarter billion disarmed people killed by their own governments in the 20th century, plus all the combatants killed in two "World Wars" and many many others show, there is no single better instrumentality for "efficiently" killing people than governments. In more than a few cases, and most of the deaths, this is by design (Communists and Nazis).
Government is an amplifier, nothing more.