There are few actions (if any) that you could attribute to Anonymous that are any worse than the depraved behavior Anonymous already exhibits in his own home. If you are unfamiliar with 4chan.org’s /b/ I suggest you visit at least once. As it’s been put so many times: Trying to troll/invade /b/ is like pissing into an ocean of piss. The very ideal of Anonymous is to exhibit any and every example of anti-social or politically incorrect behavior. Racism, sexism, religious intolerance, malicious cruelty and deliberate ignorance are all the rule of the day. The basic premise is: If it creates an amusing response from the target, then the ends justify the means.

tl;dr: Anonymous does it all for the lulz.