Tony Blair, George Bush and a whole slew of others have committed far worse crimes than to cost MC or PayPal a couple of hours of downtime and they're still walking around free and are nominated for all kinds of prizes. The sense of injustice the existence of something like Gitmo gives me is much stronger in comparison to the part of me that thinks that script kiddies should be brought to justice (or at a minimum stopped).
Besides this action having no net positive effect for WikiLeaks, the article cited above already pushes the notion that these attacks were in revenge for Assanges arrest and that is precisely the wrong signal to send.