Many common fears such as fear of fire, drowning, losing a job are rational, although whether it's true depends on specifics.
@David3
No? As I've said if I were in my late 60's or my wife was it would be rational to start consider impeding and drastically increasing year by year notation of my or my spouses death. To not do so would be simply denying the inevitable and the truth of the matter.
@Emma JC In that case it ain't that big of a deal, symptoms aren't that serious outside certain small % of the population and small restrictions to minimize deaths wouldn't warrant whole hysteria.
If such virus has significant odds of taking you down then your lifespan won't be 110 + or even 100. Hell, you will be facing extremely low odds to living up to 100 years, this is not really reasonable and rational expectation to have. Either way just because you're healthy today doesn't mean your odds of dying aren't increasing significantly year by year at that point to the point acknowledgment and coping with it in time is reasonable. Of course, it's wise to accept inevitability of death from early in your life as unexpected event may hit you when you're young even if your odds are quite good at that age.