[stiangrindvoll]

A blacksmith knows good and well that his newly forged hammer, meant for building and construction, is also used for destruction and despair.

[kennywinker]

I'm pretty sure a vanishingly small number of hammers actually get used for destruction and despair, so I would have no problem being involved in hammer production.

It does not just matter that something CAN be used for evil, it matters how likely it WILL be used for evil.

[thinkloop]

It seems you fully understand op's point!