I was just talking about how he has handled similar situations in the past not as options for the Joker.Joker don't scare easy, especially when he's completely in control of the situation.
And there's the "I've got 99.9% chanvce to shoot him dead" gamble as opposed to the "I've got 15% chance to talk him down gamble" or the "I don't even have a snowball's chance in hell" gamble of hitting his hand with a thrown gun at 50 meters.
He doesn't have to shoot the Joker dead when he can just shoot him in the knee caps.
I heard Rucka once proposed that exact same story idea but was turned down.Or indeed when it is flatout stated several times by, I think Chuck Dixon, that Bruce Wayne never ever sleeps with any of the myriad of supermodels he dates. But somehow escapes being gossiped about being the gayest billionaire in Gotham.