Most Wiccans would also say that if I give someone a knife, knowing they are capable of killing, and they use that knife to kill, I have committed harm. I vehemently disagree with this.
I probably agree with you, since just about everyone is capable of killing, but most people don't wind up killing others. But to give someone a knife, knowing that they intend to kill, I feel, is contributing to their crime. In that case, you are culpable, and you have done harm.
I'm not clear, however, whether you meant to discuss the case where someone intends to do harm, and you knowingly give them the tools to do this. It seems to me unlikely that you'd claim to be exempt from accountability in that case... (?)