Regarding your last point, I agree, however it is not as important and it does take up resources that could otherwise be used for the people who need it (journalists utilizing tor, victims trying to get away from abusers etc).

Especially given that there are still alternatives to piracy without tor, whereas there are far fewer alternatives for these people.

That said, you're still right, it's minimal. Overall though, options for piracy without tor are accessible and should still be used when possible. From my understanding, few circumstances arise where pirating over tor is a better method for you and for others

Basically, use tor for legitimate content to help make tor safer for others using it.