While it’s true that knives and guns have both legal and illegal uses, it’s another straw man in this context, irrelevant to both neural networks and copyright law. In the case of neural networks, you’re distributing the copied material along with the tool, in the form of network weights, thus breaking the law by distribution whenever the network can reproduce significant portions of any of its individual training samples, or whenever you didn’t have legal permission to use the source training material.
> If you understand that the model is a tool, and that as a tool it can be used to generate activity that can violate laws and be used for other perfectly legal activities, then as a broad principle the distribution of said tool is not a violation of said laws
That statement is incorrect, the logic is flawed. Just because a tool has both legal and illegal uses does not necessarily have any bearing whatsoever on whether the tool’s distribution is legal. Tools that are illegal to distribute can have legal uses, and that does not make them legal to distribute.