However, suppose somebody specifically designs a gun that's optimized for criminal uses. Maybe they design the surface so it's very hard to lift fingerprints off it, they have a shield to stop you from getting powder residue on you when you fire it, and so on. Or say they advertise its use for criminal purposes intending criminals to buy it. In that case, it seems reasonable to hold them responsible, even though they lack any specific knowledge that any particular purchaser intends a bad use.
What?
So building a safer corrosion resistant firearm = marketing towards criminals?
No, on two counts. First, I never said anything about corrosion resistance. I was talking about a gun that was specifically designed to be optimal for criminal uses. Second, I never said that design implies marketing. Notice I said "
Or say they advertise ...".
How do you make a gun optimized for criminal use?
I gave some examples. It could have a coating specifically designed to make it more difficult for law enforcement to lift fingerprints from the gun's surface and that served no other purpose. It could have a shield to prevent a person from getting gunpowder residue that could be detected by law enforcement but served no other purpose. I'm not a firearms expert and this was simply a hypothetical. If you have some issue with the specifics, make it a car specifically optimize for running people over and escaping.
I can see a case against a dealer who blatantly advertises "We will disregard laws and not follow federally mandated background checks when selling firearms." I have never met one who did that though, but i am sure there are some out there. Of coarse I come from a family that illegally ran guns and supplies to the Continental Army and helped run the underground railroad so I may see things differently.
That's a somewhat different case. I'm not talking about someone who violates the law. I'm talking about someone who stays within the law but specifically and intentionally profits from helping people commit crimes, though without knowledge of any specific crimes he's assisting.