There's truth in that satire. War and hellish crime didn't begin with the invention of the gun, or even good industrial steel cutting tools for that matter, and it will not end if they are disinvented, unless people change. Yes, if, God forbid, you want to kill somebody, or you are forced into mortal combat by an aggressor, you can do it more efficiently with a gun than you can with muscle-powered weapons or common tools pressed into service as weapons. At ranges greater than a couple of paces, in a fight between a guy with a gun and a guy with a knife, spear, or shovel, bet on the guy with a gun. But, if nobody has a gun, older weapons will work as well as they ever did.
Every kitchen contains the tools for fatal domestic violence.
And many a child dies of blunt trauma at the hands of someone who should be their guardian, and it's only local news, if that. On a larger scale, there have been upwards of a million people killed the last several years in genocidal war in central Africa, and it's been mostly machete work since most of the participants are too poor to own guns. And a machete is an essential life-giving tool in tropical agriculture. In places that are better organized, it also may not matter whether there are guns about or not. Japan and Switzerland both have prosperous economies, strong social pressure to conform, very low murder rates, and very high suicide rates.