If I fall 1 feet one hundred times, I'll probably be Ok
If I fall 100 feet once, I won't.
1m people dying in 1 day is not the same as 1M people dying over a decade.
Also. People generally dont fear death itself. This is expressed by people in pallitative care. Its the chaos and uncertainty preceding death that is really feared
If that one million people dying is followed by 3649 days of no one dying from that cause, yes it is.