We are overly optimistic in the environment. Our history shows that continuously. We have totally underestimated throughout history the consequences of our actions. We know a lot of known unknowns, and there are a whole lot of unknown unknowns we don't know about yet. We just have to realize that we are overly optimistic.
I don't think there's any argument, if you look at the data, that we have totally underestimated our various risks through time. We haven't even begun to put together the multiplicity of how things interact together.