The one I was thinking of was capitalism vs communism. I have had many communists tell me that communism only works if we make the whole world do it. A single point of failure.
I wouldn't call that a single point of failure, I'd call that a refusal to test it and an admission of extreme fragility.
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!