I completely agree with you, in principle. Though sometimes we have to reevaluate the system and a good way to do this is civil disobedience, which I consider what SciHub is doing.

>We've decided copyright is reasonable as a concept

I disagree here, I think copyright is a great idea, but more and more often, executed poorly.

>Absolutely nothing prevents scientists and academics from publishing in open-access journals

To some extent you are correct, but if you want your paper to be read and spread your knowledge this is the only way. And yes recognition and money is also a factor

As for your question, the law should absolutely step in, but just because it's the law doesn't mean it's right and it can't be corrected

Edit: formatting