Viruses or bacteria aren't 'bad' or 'good' in themselves. The former is arguably 'life' and the latter is a single cell organism. Free will or morality are fore

Viruses or bacteria aren't 'bad' or 'good' in themselves. The former is arguably 'life' and the latter is a single cell organism. Free will or morality are foreign concepts as to how they behave. 'good', 'bad' or 'successful' are labels we, humans, attribute to them. Micro organisms are all about spreading genetic material, since they are so small, they have evolved passive strategies to do just that. Such as using a host organism and hitching a ride via fluid exchange. What makes all the difference is where they will end up, and how they behave in particular environments. Coronavirus outside your body is harmless, but if it gets in your lungs, it may destroy those while it replicates. Your gut teems with bacteria. There are dozens of species living in your colon. And you actually need them since they help break down food into its constituent parts in order for your gut to be able to absorb the nutrients. https://en.wikipedia.org/wiki/Human_gastrointestinal_microbiota https://en.wikipedia.org/wiki/Human_gastrointestinal_microbi... However, if your bowels get perforated and that bacterial contents seeps between your organs, you'll get in deep deep trouble: these bacteria will start to infect organs they shouldn't infect, get into your bloodstream. You'll get sepsis and risk death. So, harmless bacteria turn deadly if they end up in the wrong spot. The interesting part about viruses is that through the way they operate - injecting itself into the DNA of our cells which will then bang off new copies of the virus - their genetic material has embedded itself into our own genome. It is estimated that 5 to 8% of the human genome consists of "endogenous viral elements". These are basically viral left overs, not viruses themselves, to be clear! https://en.wikipedia.org/wiki/Endogenous_retrovirus https://en.wikipedia.org/wiki/Endogenous_retrovirus Micro organisms have been with us for a long, long time. We have evolved concurrently with them. And we will keep evolving alongside, evolving strategies - such immunity, or our ability to understand how they work - to ward off infections while new species will pop up and some might be successful in thwarting our evolved defenses.