It's a sensible reaction to be worried by past death rates, of course, but at least in most Western countries the conditions of public health have strongly emproved since the 1910s; also, we're talking about generations who for the greatest part have got a better healthcare since infancy, haven't known famine (= body more resistant) and are generally more aware of health issues (in this, we're a relatively lucky bunch- apart from cruch and other "niceties"). If I were to study the problem, I'd probably look more to the data from the Asian flu of the late 1950s, when population's condition was a bit more similar to the one we have now, even with the war and with the notable difference of the best-loved targets of this flu. Well, I don't know if history repeats itself, but surely doesn't duplicate exactly
I am not saying that it's not dangerous; just, as Douglas Adams would put it,
don't panic. Be careful, but not obsessed.