Using a constitutional law to overrule an illegal state law (as in Loving v. Virginia) is different to declaring copyright illegal.
"Illegal" doesn't really mean anything other than, vaguely, "contrary to law". Saying that an unconstitutional law is "illegal" makes as much sense as any other use of the word. And striking down an unconstitutional federal law (like the Copyright Act) isn't particularly different from striking down an unconstitutional state law (like Virginia's anti-miscegenation statute).
Also: what happened in Loving, IIRC, was that their marriage was not recognized in Virginia after they moved there, and they sued the state (hence "Loving [plaintiff] v. Virginia [defendant]") for whatever benefits they were being deprived of. It was not a case of criminal prosecution with the defendant pleading that the law under which he was prosecuted was unconstitutional. Although that happens too.
The court is just there to interpret laws, and activist rulings undermine democracy.
You should read a book that explains the system of common law that governs jurisdictions like the UK, US, Canada, etc. Then you would be less uninformed about how said system works, and how the common law system is perfectly compatible with democracy; indeed, how early conceptions of democracy (on the US constitutional model) embraced the common law system as a check on the excesses of the executive and legislature. You seem to think that living in a civil law jurisdiction would provide you with a more perfect democracy; if that's true, I encourage you to move to France or Quebec and keep us posted on the dramatic enhancement of your democratic experience.