The law in this area is horribly stacked against any individual caught up in such a case, with the full legal weight of the music industry bearing down on him.
See this write-up from earlier today (http://bit.ly/qMtUe) on how Joel Tenenbaum was basically worn down on the stand until he wound up finally admitting to liability.
Once he did that, the judge took that issue away from the jury. This means the jury was instructed that the defendant was already found liable and that their sole job was to pick a damage number using the federal statutory guidelines.
The judge had already gutted major parts of the defense before the case ever got to trial (for example, fair use was tossed out as a defense).
In such a context, even a sympathetic jury could have done little or nothing, though it appears this jury was not sympathetic.
The bullying tactics used by the music industry in these cases are atrocious and represent among the worst that the law has to offer. What is needed here is a broader solution likely involving a revamp of the copyright laws.