Are lockdowns justified?

[FlatAssembler]

Donald Trump said that COVID-19 will disappear naturally. And, when you think about that, thinking that does not appear so silly. In fact, it seems to me that, if you apply the knowledge of high-school biology, that is what you would expect. So I want to know why it is wrong, exactly. Which logical fallacy are both Donald Trump and I committing when thinking about whether it is to be expected that COVID-19 disappears naturally?

Did small pox disappear naturally?  What would make you think that as long as a virus/germ/bacteria has a host it will just magically disappear?

Really not the same thing. Again, smallpox is a DNA virus, so it is not nearly as prone to mutation. Furthermore, smallpox had very closely related viruses with which it could presumably (I haven't checked it) mate (cowpox...) to reduce the impact of those mutations. No virus closely related to COVID-19 attacks humans so that COVID-19 can mate with it.

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Donald Trump said that COVID-19 will disappear naturally. And, when you think about that, thinking that does not appear so silly. In fact, it seems to me that, if you apply the knowledge of high-school biology, that is what you would expect. So I want to know why it is wrong, exactly. Which logical fallacy are both Donald Trump and I committing when thinking about whether it is to be expected that COVID-19 disappears naturally?

What comes to mind is yours and his ignorance of science.

So, if you are less ignorant of science, answer my question. Why didn't COVID-19 die from inbreeding after jumping from bats to humans?