[Raev]

There are three problems with this superficially reasonable graphic.

1. If something doesn't work, it doesn't work. Four plies of toilet paper will not stop an artillery shell any more than one.
2. If something reduces the chance of a negative event, but the event keeps happening, eventually it will occur anyway. In EQ terms, no matter how much CR you stack, you'll eventually roll 0 and eat a full damage Ice Comet, so you have to make sure to stack enough HP to survive the worst case. In COVID terms, it means that you will almost certainly be exposed unless you totally quarantine yourself, so you need to supplement vitamins c/d & zinc take basic measures to reduce stress and so on.
3. Interventions are not free! If you check the AAPS site near the end they list mask side effects. Unsurprisingly, you get less oxygen when wearing a mask. This means your entire body works worse. 37% of healthcare workers in Sweden reported headaches when wearing a mask. And apparently it also makes your teeth worse.