You're still responsible for the consequences of what you produce and sell.

Surely you would agree that making landmines simply because there are people who want to buy them would be an immoral choice.

gary's point: embrace reality

your argument: but what about this hypothetical?

Your argument: "I have no morals, why is everyone arguing about them?"

You do you, but let's not act in bad faith and dismiss others dispositions.

If you think X is immoral, and a functioning market creates much more X, presumably that is what is immoral about a functioning market.