I think the best way to visualize a virus is to visualize it as a string of DNA.
You are correct that immune health is the best way to defend against COVID19.
The problem is that our governments did a horrible job promoting immune health.
What they did instead was to impose mask mandates and shut down businesses, schools and churches in a vain attempt to control a virus.
The government censored people who were promoting immune health and they villified doctors who discussed treatments.
For example, it was known in the first weeks of the virus that that was a direct correlation between vitamin D deficiency and the severity of COVID19. We could have reduced mortality by about 25% if this was publicized.
It was known before COVID that certain corticosteroid treatments reduced the cytokine storms that took many lives. The CDC banned the use of such treatments.
The criticism that I see are aimed largely at bad policies by overbearing government that censored the debate.
!WINE
RE: Virus: the organism that always brings polemics.