If it's ok for a bunch of vigilante to hack Sony. I don't see why it woudn't be ok for other vigilantes to hack and make trouble for the people that hacked into Sony.
It will most likely lead to bad things in the end but personnaly I coudn't reproach someone that would for example expose the identity and adresses of the people that breached the PSN....They have it coming by their actions..
As for Sony their next move should be evident.
Offer a cash reward for information leading to the perpetrators of the breach and see how tighly knit that community of anonynous hackers really is...








