If pandemics were just a problem of modern day society then it might be something to do with modern day living.
However, the black death of the middle ages, far worse than anything we are experiencing now - killed more the half of all the population of that time. Way, way before any sort of modern living,.
The 'sweating Sickness' of the 16th century, killed untold numbers, - woke in the morning healthy, felt ill by lunchtime and dead by nightfall. all ages and all social groups.
The biblical plagues, (based on historical events),, the so-called Spanish flu of 1917-1920 (originating in USA), killed millions world wide.
Others, since then, Asian flu (so called) Hong Kong flu, Ebola, Sars, etc. etc.
So many of these are now controlled and treatable by modern science. Perhaps nature just feels, every so often that a cull is needed of Homo sapiens!!!
Really do not think we can blame the current one on modern living.