That's the schtick with a natural disaster. It affects everyone. (it is unironically that very impartiality that makes it a fair judge and arbiter of such a population reduction, vs a purely political purge, engineered by people.)
(I always mostly wondered about all the occupants of that helicopter that Nick Fury saw as thongs unfolded. All of them. I mean we can assume the pilot went (then... later, where? - based upon the marching band, there might be an issue), maybe passengers (ditto). But any that didn't... they fall, but thus explicitly do not fall within the stipulation of 'later'. There are other questions, but that's my biggest one.)
It is said that a 'fortuitous' recurrence of the Black Death, coinciding with Elizabeth I's effort to de-Restore cousin Mary's Restoration, helped to kill off the die-hard/blow-hard senior clergy and led to to the more moderate nature of Anglicism, as well as suppressing hold-out Catholicism in the realm. That was a demographic bias, though, and I'm not sure we can't say similar for this case (but different). And who knows what would have happened if certain lordlings of the time hadn't been extinguished and thus ended their influential family's line. Coin-flipping is gambling, whichever way you look at it.
Only one problem with that analogy; Thanos' snap was not a natural disaster. It was an engineered disaster, that just did not care about collateral, only that 50% of total population went poof. (literally poof.) In this case, the disaster happened as a result of natural consequences, is not artificially imposed, and there are things you can do to protect yourself and others. Functionally, they are not even equivalent at any level.
In fact, we are having this discussion about it BECAUSE there are things you can do to protect yourself and others, that the afore mentioned demographic simply refuse to do, because "FREEDOMS!!". (but mostly denial.)
The assertion is:
People who take the steps to mitigate contracting it, and further take masures to prevent the spread of the pathogen will do those things; when they do contract it, it has a higher probability of dead-ending with them, because they take those precautions and do things right. With the demographic that does not, and willfully does not, the pathogen spreads exponentially. The people those people tend to be around, tend to be like-minded people who are likewise not self-isolating (which is WHY they are in contact with them, in most cases!), and who will likewise spread it to all their like minded friends. (which is why it spreads exponentially.)
Due to this combination of factors, while people who do everything right, and are very socially mindful, will indeed contract it, and a good portion of those will either die or suffer lasting harm from the infection, VAAAASSTLY MORE will experience death and permanent injury from the exponential growth demographic. It is the negative behaviors of the exponential growth demographic that are actively contributing to their deaths or later suffering-- Simply by altering their behaviors, they too could experience the more linear infection rates, rather than the exponential one, but they refuse to acknowledge this as fact, and so experience the exponential curve.
The counter-argument is that the socially moronic demographic, being socially moronic, will result in vastly more people who are doing everything right ending up getting sick, and having lasting damage or death as a consequence-- That is simply true. No contest. However, the implication is that you will get the stupid demographic to stop being stupid. You won't, that's just pissing into the wind. Everything that could possibly be done, short of hogtieing them and barricading them into their damn houses, has been done. They continue to be stupid. Since you cannot fix stupid, you should instead look for whatever rays of light can pierce that dark shadow. That is exactly what MS is doing here.