I like living in my head because in there, everyone is kind and innocent. Once you start integrating yourself into the world, you realize that people are nasty, mean creatures. They're worse than zombies. People try to crush your soul and destroy your happiness, but zombies just want to have a little nibble of your brain.
We know there are certain types of viruses that are nasty - influenza, for instance, is an area that is not a blindside. But a lot of viruses have come out of nowhere, like H.I.V., or to a certain extent SARS. Because we know we have the potential to be blindsided, we really have to investigate the unknowns.