When the fallout happens, he'll realize the kind of danger he's placed everyone in. ( not that kisame wants his shit to end, it's hilarious from his point of view. ) Until then, everything goes in one ear and out the other. Just look at his responses.
He is unprepared for what his actions will bring. [As much as he has faith in Naruto... this situation is unprecedented. This is far beyond them.] And it will endanger us all.
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( he's curious to know. )
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( pity that you won't let him kill him, itachi. god help them all when the fallout happens. )
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[Kisame will listen to his decision either way, but he still asks.]
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( nor does he have reason to actually kill him. for all his mischief, kisame does find this genuinely, incredibly amusing. )
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[It's not accusatory. That's just how Kisame is and they both know it.]
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You?
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[Avoiding collateral. Possibly preventing it.]
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( and that's that. )