system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Why hasn't Magneto killed Red Skull and Baron Zemo?

Or really just, Hydra as a whole? Like I understand that there is the meta reason of, comics still want Hydra to be reoccurring bad buys, but I am disinterested in meta explanations.

Is there a in fiction reason it hasn't happened? It has it actually happened in a previous run, and I missed it? Do tell.
gpt
He locked Red Skull in a room to starve to death in Acts of Vengeance but he was rescued. Besides that Magneto is simply too busy or doesn’t care enough about the existence of fascists. It helps that Zemo and Skull have an impressive amount of resources, followers and superhumans under their control which would deter assassination attempts. Magneto is powerful but not unbeatable by any means. For example there’s nothing stopping even a mildly powerful magic user from incapacitating him in a way that he can’t defend against.