Your view on the law seems a bit alien to me. My opinions on what the rules of the law should roughly look like, are largely independent of who specifically is involved in a legal dispute. Sure I guess if Hitler was being sued and the only way to stop him was this lawsuit by Sony, I would probably concede that on balance it's better to have a slightly worse legal standard around copyright. Otherwise, I think having a law that best reflects my moral views and creates the best incentives for society in general, far outweighs how i feel about the plaintiffs.

As for how I arrive on my views, it's obviously not an entirely rational process, but the rules you get from viewing property rights and self-ownership as fundamental seem to lead to the most preferable outcomes to me. If I were forced to adopt a more deontological philosophy, it's also the one that has the fewest obviously absurd conclusions, though not entirely. From this it's, in my opinion, pretty obvious to be skeptical of copyright law more generally (Ayn Rand would disagree) and therefore I welcome any precedent that weakens it.