OK, but the military is not just a nail company. They make way more stuff than just weapons, a lot of regular things came out of military funding.

For all the seller knows they could be using it for search and rescue. They are not responsible for the end result of what happens to their product when it ends up in the consumers or buyers hands.

Only in cases of negligence does that apply.

The military using these robots as weapons is very different from Boston dynamics using these robots as weapons

It’s really quite simple.

That said, you seem to think the seller of a product has a responsibility to sell only to safe places that won’t go against their own morals and values, and you may have a valid point to that but that’s an entirely different thing than saying “Boston dynamics is itself making robot death machines”.

They make machine that become death machines when modified, would be a more correct statement.