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Maybe Ahren isn't really cognizant of just how far Six-Four has fallen. He's awfully concerned about Six-Four striking out on his own and seeking vengeance instead of operating within the "family unit" of the Ghosts, while he's not visibly concerned about any of his actions. The reader is left to infer the meaning of "We need to talk", but the one thing it does not imply to me is "you've become as bad as the people we fight and I'm placing you under arrest". My only problem with that is that even if Ahren doesn't learn about the torture and attempted murder, there's simply no way that he or the rest of the Ghosts can be ignorant of what Six-Four did to Daniel and Elizabeth Rose once they start putting two and two together.
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Six didn't fabricate anything. He convinced the DA to arrest them based off of existing circumstantial evidence. Possible embezzlement, fraud, aiding and abetting (all of which are most likely a weak link to Bonnie/Ebony Rose). And to top it off, someone died, they benefitted from the death (a promotion).
It's barely enough to arrest (they would have the ability to flee the country so arresting and detaining would be the logical next step pending further investigation/trial), but most likely not enough to convict, it is way too circumstantial. Since it is public knowledge, it is clear that the Ghosts are aware of that much. What they are not aware of is Six's motivation and his goal.
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why hadnt he taken advantage of the offer of help Ahren had made? Because he know [u]if[u] the Ghosts understood what hed [u]intended[u], [u]they would have stopped him[u]. These were people he respected, and every one of them counted Ebony Rose and the Shades among their enemies, but they would [u]never have tolerated his actions[u]. He knew many of them would understand his need for revenge. Several of them would be willing to turn away while he enacted it. But he suspected that none of them would approve of the way hed gone about it.
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At the end of the story, all Ahren knows is that Six-Four went to St. Martial to recover suspects that have fled the country, and was soundly beaten before returning to the base. What Ahren is not aware of is that Six went there to confront and murder Ebony Rose.
I agree, that Six's actions were motivated by revenge and his goals were of a villainous nature. However, the way he went about it was at worst border-line legal. Further, considering that the Rose's fled the country, it implies their guilt, and it is unlikely that there would be any sanctioned investigation into the 'legality' or 'appropriateness' of the Rose's arrest.