Forgive me for showing up here, but I feel this can help reconcile the situation.
The rumors quoted above clearly state that the two companies hire third-party pilots to carry out the attacks. They'd never openly attack each other, as the government would likely cut off any financial backing they may have. Sure, both companies know what the other is up to, but they still need to keep the appearance of being friendly in the public's eye.
As for the "no such thing as unlawful actions in the omegas," even though the Omegas are technically outside house space, the houses still claim territory within them. Take a look at who owns the tradelanes, for example. For that matter, attacking another lawful entity is still, by definition, an unlawful act, regardless of whether you're in house space or in the farthest corner of the Omicrons, simply because the server rules state so. Obviously exceptions are made in specific cases, but as has been said already, this is not one of those cases currently.
