It’s a losing effort.

If they argue that guns are exceptional because they’re a weapon, you counter with bows and arrows and knives, they respond with the ease and efficiency of the gun.

If they start with the ease and efficiency angle, you counter with cars, and then it’s all about the base design being a weapon.

For these people it’s multiple factors. First of all, it’s both, guns are weapons, and they democratize lethal force. For these people, that’s enough for them to absolve murderers of some of their guilt, to be shifted to the manufacturer. It’s not any one factor, it’s several combined, so that guns occupy the unique intersection of factors they’ve decided matters…

But ultimately, at the end of the day, the biggest driving factor behind it is, “I don’t own or use guns, so I’m okay with banning, or effectively banning, something that I won’t miss at all, regardless of whether it’ll do any good. It’ll make me feel better, so practicality, or others who may be negatively impacted, don’t matter.” Their feelings overrule legal precedence, rule of law, protected freedoms, practical arguments, views and practices of others, and everything else that might get in the way of making them feel better.