You can use the Merrow No. 17 Locket gained from the quest "Such Sweet Sorrow" to resist JoJ's Charm. You'd probably want everyone in your alliance to have it, just to not take any chances, but I think JoJ's target is just whoever has hate at the moment.
I'm just posting this to say that this guy is worth fighting. The Justice Torque made me drool even more when I swung my GK. And my friend has the Sword and just loves it, he says he'd take on Absolute Virtue for it :P
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One with the heart of a lion -Citizen of Bastok- Character: Zyro Rank: 5 Sam 53/War 26 AF1:O/AF2:O/AF3:O/AF4-6:X