system
Given the following post, respond as if you're commenting on Reddit:
human
Why are some contagious diseases terminal? Wouldn't it be more beneficial for it if its host stayed alive?
gpt
Not if it manages to spread before killing the host. Perhaps it causes diarrhoea which dehydrates and kills the host, but the diarrhoea causes the infection of many more hosts. It isn't about what the disease thinks is beneficial, it's just what happened to work.