I think that, in the vast majority of cases, plugin piracy is wrong.
My main gripe began when I read a couple of posts about gray areas.
Thing is we all have our gray areas, there's no exception. The sooner we realize that the sooner we can have an actual proper nuanced conversation - which a few people started to do in this thread - and try to find out where we need to actually draw these arbitrary lines so we don't fuck someone over. And if we ended up doing that we need to be willing to talk about it and have the humility to change.
Some people naively think there's only right or wrong, the lack of nuance makes them a lot more resistant to change. What ends up happening is the lines these people draw (also arbitrarily, even if based in culture, social class, etc) eventually hurts someone, not intentionally (in most cases), and their inability to change makes things unnecessarily harder for the people getting hurt by it.
To me the realization we all navigate gray areas is about plugin piracy as it is for basically everything else as far as morality goes.
"Only a Sith deals in absolutes"