The concern isn't that tens of millions of people will die. The concern is that enough of the population could get sick to ground society to a halt. If 10-20%

The concern isn't that tens of millions of people will die. The concern is that enough of the population could get sick to ground society to a halt. If 10-20% of our hospital staffs and firefighters and police and teachers are sick (or missing work to care for sick relatives), that creates a major strain on the fabric of society. The deadliness of this flu isn't the concern, it's virulence is. And that's ignoring the "it might mutate into something killer" issue.