Is that not just the DM equivelant of being a murder hobo?

No. By that logic, a DM would never be able to balance the game, wouldn’t be able to have a powerful BBEG, and wouldn’t be able to have powerful non-killable NPCs.

It’s the DMs job to control the world and guide it. Reacting to them slaughtering people and destroying towns doesn’t make the DM a murderhobo. It’s simply part of the job