Let's keep things in perspective, shall we?
Yes, getting a botnet is "premedidated and pure WRONG". But, believe it or not, it is also today's equivalent of what would have been an elaborate phone prank in the 80s.
The majority of these botnets are not run by organized criminals. They are run by adolescent nerds. I'd argue the same is true for the large majority of anyone involved with "Anonymous" in any shape and form. It's primarily a youth movement.
So, like with any other prank, I'm all for giving those kids a slap on the wrist (note how I didn't say "prison sentence").
However, to me the more interesting question in all this is a completely different one: Why do some of the largest organizations on the internet fail to protect themselves against a moderate attack like this?
It seems humiliating, to say the least, that a bunch of teenagers can take out Visa, Mastercard and Paypal at a whim. This could have been trivially prevented with technology and money. Thus, considering the impact it had, the first lawyer-word that crosses my mind is not "sue the kids". It's: Criminal neglience.