So, I have a few comics that are actually about expanded/grown women being helpful post-gains, just to point out some counter-examples:
Muscle:
https://www.musclefan.com/comics/The...hma-Rau/c=140/
GTS:
https://www.giantessfan.com/comics/Rescue-G-T-S/c=157/
I don't think being giant is, in and of itself, any reason to introduce violence or death into a story. If you want to frame it as some sort of power or revenge fantasy, or just have a sadistic character, then okay, it fits, but I absolutely don't see it as required for any sort of fetish story to be enjoyable. (Heck, I'm working on a vorefan script right now where getting swallowed isn't even injurious, much less lethal.)