It's the simplest explanation to account for the *timing* of the hack. Well, there was also the other possibility I mentioned - non-gov hackers pissed off at the forum's role in bringing down DPR.
Your logic is making my head hurt.
The simplest - and as it happens, the actual - explanation for the timing of the attack is "for the lulz". You really think that someone pissed off about "the forum's role in bringing down DPR" (the forum didn't need to play a role - he made his email address public and law enforcement could have easily obtained access to his gmail account and confirmed he used it to register his account that way) would go to the trouble of making an animated flash intrusion with music?
If someone was blaming the forum for helping bring down DPR, wouldn't they be likely to do something
malicious if they gained access, like trashing the database and erasing everyone's accounts?