Something to consider.
Eve certainly is a sandbox but its not just a sandbox. It has a backstory, npc empires, history and all kinds of make-believe set dressing that help people suspend their disbelief and get involved with the grand space opera goings on. If it was just a sandbox you'd have 5000 empty systems for players to do what they will in and not much else.
Now the reason that the goons (or anyone else) can pull off an event that will lead to the screaming and wailing and gnashing of teeth of the empire dwellers is that there is an empire space - there is an area of Eve that has some protection against nihilistic destruction cults in Null. If that area wasn't there you wouldn't have the carebears to terrify in the first place.
My position on all this is that it would be sad and rubbish for CCP to ban the goons over this kind of thing. But it would be perfectly fair for CCP to roleplay some kind of consequence as a result of this.
Jita is the biggest trading hub in Eve and commercial capital of the caldari state. Is it that much of a stretch to believe that the npc leaders of the caldari state might set Goonswarm -10 for the duration? Or that Concord itself might respond to a weekends slaughter by globally setting all members of goonswawm -10 for a month as punishment.
It seems to me that Mittani through goonswarm is setting himself up for a massive pissing match with CCP through the medium of Jita burning and he's stacking the deck. If CCP do nothing he wins (because CCP is obviously too scared to do anything) and if CCP do something then he wins (because CCP is obviously too scared to do nothing).
But what would be a reasonable response from CCP is to simply roleplay the responses of the NPC empires that are impacted by this kind of thing.
A few years ago
my own corporation got involved with a small event run by CCP that ended up with us firing on a couple of event actors flying Mordu's Legion merc cruisers defending a Sisters of Eve convoy. The event actors at the time got furious with us and promised consequences which they duly delivered. For the next three years Star Fraction was officially set -5 by Mordu's Legion. That ruled out missioning in pureblind and messed about with refine efficiency and all that jazz. But it was cool. We did an in game action (executing a mordu's commander guy) and we were prepared to take the consequence.
Goonswarm is an organization hundreds of times bigger than SF ever was. Its capability to mess with the server is far greater than our alliance could dream of. But I see no reason why it should be above consequences for messing with the sovereign space of npc empires.
Best outcome is that Goonswarm get to burn jita to their heart's content and then the event team work out an appropriate sanction in roleplay terms to demonstrate there is a consequence to attacking the biggest trading hub in Eve.
But if the Goons were then to howl and shout and call foul play over it.
Well, then we'd know who the real carebears of Eve actually were.