Weev might have said that he "stole" the information or that he "intented" to perform an unauthorized access but ultimately that doesn't matter. There was no access control to prevent the internet's default of "everything is visible" so that's precisely what happened. It's not a hack no matter how badly he or the government want it to be. Intent matters not one iota.
The same applies to this case. He intended to access something he knew he shouldn't have had access to. Thus why he is guilty.
Furthermore, just because someone feels that they have done something wrong does not make what they have done a crime. The law also must consider that action to have been illegal.
Hopefully, the appeals court will determine that accessing a public unrestricted URL cannot be considered illegal, regardless of the mindset of the person who might choose to access it.
and cases where the circumstances were held to show no larceny: R. v. Wood (1848) 3 Cox C. C. 277 (banknote found on open land) R. v. Dixon (1855) 7 Cox C. C. 35, 25 L. J. M. C. 39 (lost note without mark) R. v. Shea (1856) 7 Cox C. C. 147; R. v. Christopher (1858) Bell C. C. 27, 169 E. R. 1153 (unmarked notes and purse found in public place)
I used a $50 bill (which is implied to be unmarked) purposefully.
Unfortunately none of these excuses are valid. He knew he was accessing something he shouldn't have been. If he did it once or twice and stopped that is one thing, intent is a major part of the law, and he intended to exploit something he knew he should not have been. That is why he is being found guilty.