This hypothetical knife that you've invented still doesn't make any choices. A person still makes the choice of how and when to use it. That's all that matters. Only things that can choose to act can be judged as ethical or unethical.
The tool is a lump of metal apart from ethics, but making the cliterectomy-knife was a choice someone made. We can judge that decision.
The tool is a lump of metal apart from ethics, but making the cliterectomy-knife was a choice someone made. We can judge that decision.