> defense

Improper use is that of the user, not inherent to the tool.

Scolio: guns. Respondeo: guns are much more specialized (one-use) than knives. Proper use of sharp knives when what was shipped was a butter knife is understandable.

(The simile is not fully overlapping but should give the idea. The instrument must be flexible; if it is misused it is then a responsibility of the abuser.)