no, you're incorrectly assuming why i agree to copyright, despite me telling you exactly why i agree to copyright: because of the threat of legal action. not to mention that i neither agree nor disagree with your statement that copyright benefits society.
No, I'm telling you why it is you agree to copyright, as you seem unaware. Or rather, why a moral version of you would. If you choose to act immorally, fine. But at that point, you're acquiescing to my claim that piracy is immoral.
The law isn't relevant here. The agreement you make is.