I also have concerns about this.
However, there are different ways out of it. One is to prescribe. And I have NO doubt that the drug companies are rubbing their hands together. If I didn't care, I'd be buying shares now.
The other is that instead of medicalising it, we push the idea that people are having HEALTHY responses to very difficult times and come up with ways to help deal with that at a national level. Obviously there will be cases where daily life is so impacted for too long that prescriptions will genuinely help. But the idea that we're allowed out like normal and everybody feels better the next day is just ridiculous. In some cultures they mourn for 40 days. But does anybody think that on Day 41 everything is a-ok? Public health campaigns that it's NORMAL not to feel good after something like this (and during it) would be good. Support groups would also be good for some people. Help in processing what's happened in their lives and the world around them.
But essentially, the message should be that "normal" is quite a large range and it's normal to feel bad during and for some time after abnormal/scary/traumatic circumstances. Diagnoses/labels are not necessarily helpful in this situation - unless, like I said, daily life is serious impacted for some time.