This is rational. The odds of disaster are >10%, if history is any indicator. We had two world wars in the last century, for example. Events happen. Past doesn't predict future, but there are dozens things which can go wrong. If I had $100B, it would make sense, from purely an expected value perspective, to invest up to perhaps $10B preparing. An expected value perspective isn't the right way of looking at this, but…
Sure, we should look out for everyone, but my kid comes way ahead. If I had $100 and I had to spent $1 to increase her safety profile, I’ll happily do it.