That's utterly silly. Who do you think is responsible to protect people from catastrophes if they aren't? You? Me? Rampaging hordes have been a hazard since humanity learned to sharpen sticks. Anyone unprepared for them asks for what they get, and that's the fact of evolution.
This isn't a comment on rampaging hordes' responsibility for their actions. It doesn't address them at all. In the context they are comparable to volcanoes and earthquakes, just another disaster that human societies face from time to time, and which they are either competent to survive or perish therefrom. If you want to discuss the responsibility of rampaging hordes for their rampages, that's a different matter that we should not confuse with the matter at hand: the personal responsibility of people for their personal survival.