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No matter how we treat bugs, humans as a whole kill a heck of a lot of bugs. Even unintentionally, like by driving our cars or destroying habitats.
While I will conceed that there is some doomsday thinking going on, I don't think it is unreasonable to spend relatively more time thinking about the scenarios that could be most harmful. I would rather humanity overindex a little on exploring the life threatening scenario vs how great the infinite Seinfeld episode is. But to each there own!