What do you mean? In the past, deadly diseases reduced population and now we can protect ourselves. Here an image wearing masks from 1918: https://www.google.c

What do you mean? In the past, deadly diseases reduced population and now we can protect ourselves. Here an image wearing masks from 1918: https://www.google.com/amp/s/www.wthr.com/amp/article/sports/ncaa/ncaaf/vintage-picture-shows-football-fans-wearing-masks-during-1918-pandemic/531-6714df4c-7464-4949-9a5b-90f5b6170e70 https://www.google.com/amp/s/www.wthr.com/amp/article/sports... And if you're living in the US, there should be some info from your the history lessons about deadly diseases killing most of the native population... And a lot of people volunteer for flu shots, protecting those unwilling to do so.