It's not an external agent, it's an emergent property of humankind. I don't find memes a compelling idea, but regardless, memes are not viruses and culture is n

It's not an external agent, it's an emergent property of humankind. I don't find memes a compelling idea, but regardless, memes are not viruses and culture is neither a virus nor a virus-like external agent. So the analogy is very forced and doesn't really work.