Why not? I think that's exactly on brand with Kizaru. It's what makes him unique actually.
Cause I don’t think that’s what Oda intends with him, because of the scene with Sakazuki. That ends with
a) Kizaru showing real, genuine emotion- not just emotion, fury- for the first time in the entire series, at the mere suggestion that Kizaru had botched things
b) Sakazuki actually apologising- again a first
That scene was meant to make us think Kizaru genuinely did all he could despite the emotional toll. Him killing Vegapunk, trying to chop Kuma and Bonney in half and lasering her at point blank pointed to a man who had made up his mind. Sakazuki actually says sorry, that’s unheard of.
But now we have thrown in this rubbish, half arsed attempt to, honestly, I don’t even know. He did the least bit possible to try and help some of them, then tried to kill them anyway. Feeding Luffy wouldn’t even have saved Bonney, he wasn’t ready until quite a bit after Kuma arrived.
Kizaru is just so half assed and I don’t find it at all interesting or well written, I just think it’s a poor man’s version of the other conflicts between duty and the Marines that Oda has written for other characters. Particularly Kuzan and Ohara