Actually, worldwide the Spanish flu killed off 50 million people, out of a worldwide population of 1.8 billion.
Assuming that before herd immunity takes control 60% of the population must have either gotten Covid19 or been immunized (no immunization yet) and the current death rate stays at 5% of the infected (which is probably very optimistic, because so far the infected have had access to medical treatment, worldwide that would no longer hold true) we are looking at 214 million people dieing.
That is more than the number of people who have died in all wars since 1900
Look around you and try to imagine that every 3rd person over 70 will be dead next year, and a lot of younger people too.
Michael