I mean, that scene, especially after Kuma's flashback, got kinda screwed.
Kuma might not WANT to kill off Zoro, but he KNOWS Zoro is half-dead already and the amount of pain is enough to even knock out Kuma himself. Zoro didn't die there because Sanji managed to get Chopper in time to treat him.
So while he didn't WANT to kill Zoro, he certainly ALMOST did.
he had no guarantee that Zoro was gonna survive or get treatment fast enough if he did.
Let's stop acting as if Oda thought it through carefully and just didnt write things as he though it would sound cool.