My take here is a little nuanced. Simply for manufacturing, perhaps not. Decisions of this kind I would settle case by case, chemical warfare agents, "no", tear gas, may be 'yes' with well laid out legal checks and balances, 'rubber bullets' more checks and balances needed, etc., etc.
Sales, whether direct or through indirectly supported wink-wink business and other organizational structures, to entities who have well documented cases of abuse -- that's a different matter. If Colt is found doing that, I would definitely find them culpable and guilty.
For NSO, Candiru and their ilk, my belief is that they are in a wink-wink, nudge-nudge relationship with the user's of the tools (usually oppressive governments) as well as Israel's intelligence complex (they are the ones clearing the sales).
Can I prove this in a court, no. Does not stop me from forming informed opinions though.