Just a reminder: This case is not related to his Pirate Bay involvement. He is accused of hacking Logica, who handles data for the Swedish Tax Authority.
How much empathy would you have if someone, not involved in TPB, 'stole' information about you from your local tax authority? Especially Americans who seem to be paranoid about their tax stuff (For example Romney). At least in Sweden your tax data is pretty much public - when requested from the Tax Authority.
As a side note: This is also true for privately held companies in Sweden, all annual reports are pretty much public. You can for example view Mojang's (Minecraft) figures here: http://www.allabolag.se/5568192388/Mojang_AB