Perhaps we need to think of the Coronaviruses as akin to extra- terrestial beings set to multiply and take over our planet?
They are living organisms. Like all living organisms, their main intent is to survive and propogate their species. They are very good at doing this.
They were new on our scene. At first we were helpless to defend ourselves. Because of the airplane the virus travelled to all parts of the world, living and propagating inside the living bodies of tourists and other travellers.
Now we have vaccines which are weapons to stop (or at least slow down) the extra terrestrials from multiplying and wiping out large segments of our human population.
At first it was the elderly and infirm who were mostly vulnerable. But these crestures have a little trick that we don’t have (or perhaps we do but it takes more time for us to develop it?)
They are able to mutate their offspring into meaner and tougher beings that are able to attack younger and stronger human beings more and more effectively as time goes by.
Anyway that’s my take on the situation we human beings are in!