> The purpose of a tool is important.

> Guns have no other purpose than doing harm.

Objects don't have purposes or intent until people use them, and many objects have multiple reasonable and dual purposes. Objects can be used for net good and net harm. A bow and arrow isn't specifically for harming humans but can be used for such. Chainsaws and meat cleavers too.

What would you like a machine gun-wielding terrorist to be stopped with? A strongly-worded letter?

On the same token of reasonableness and rationality, it's unreasonable to give a toddler a towed howitzer that's ordinarily destined for Big Sandy Shoot.