grammar - ～ないかな (Negative Verb Form with Positive Translation)

I encountered the following as I was reading chapter 29 of the manga かぐや様は告らせたい (images of the section are linked below if it matters). The lines are stated by a very cynical, depressive type character who has a irrational and jealous hatred toward members of sports clubs.

あぁほんと・・・

全員　死なねー

かな・・・・

I would have translated this to something like: Yeah, really...I wonder if they're all not dead..

Now, I sincerely doubted that that was correct since it didn't make any sense at all so I consulted the fan translation:

Yeah... Maybe... They should all just die...

This translation makes more sense to me and I assume it is a valid translation.

Could someone please explain the grammar (although I'm certain there is some slang involved) that caused 死なねー (死なない presumably) to be given a positive meaning?

Japanese panel
English panel

Answer

This ねー is ない as you've correctly guessed. かな is usually "I wonder ～", but (ない)かな often expresses one's wish. 全員死なねーかな means "I wish they all die."

かな

３ （「ないかな」の形で）願望の意を表す。「だれか代わりに行ってくれないかな」「早く夜が明けないかな」

This translates to a positive English sentence because ～ないかな is essentially a rhetorical question like "Why not ～?". You can choose whichever fits better in the context, between "I wish ～" or "I wonder (if) ～". See this related question, too.

Some more examples:

• 空を飛べないかな。


• どこかに1億円落ちてないかな。


• はやくクリスマスが来ないかな。