Who else here remembers learning that AIDS patients (people with acquired immunodeficiency) can die from the common cold, in school? Is it not common knowledge that old folks can die from a cold, too?
It isn’t just some new common cold that we don’t have herd immunity for. Different viruses have different lethality; common cold corona viruses are far milder than SARS-Ncov-2 which is in turn far milder than MERS.
When you have a mortality rate of 66% to 90% for something tha isn't a hemorrhagic fever, it's the ventilator.
Like the flu, you don't die from the flu, but really it's the last straw on top of other issues that pushes people over the edge.
But the flu is far more deadly than the common cold, it's misleading to talk about them together like that.