Hi Chad!
Thanks for your comments!
1) Technically, you are right here. We don't know exactly how the jump from bats to humans occurred. I have seen reports that coronaviruses genetically similar to the one that causes COVID-19 were found in bats around Wuhan. The reports of the first cases of infections are linked to the market in that city, however it is true that there might have been earlier unreported cases. We might never know the whole truth.
2) Anger has been defined differently by different philosophers and groups. I think most groups wouldn't argue with your definition of anger as a natural emotion, however where there are differences is in how you respond to it, and whether there are positive aspects of anger. For example, I believe that Aristotle recognized that there are some positive aspects of anger in that it drives you to try to right a wrong. However, you can't get carried away. The Stoics had more negative views of anger, and considered it as a temporary madness. The Buddhist views of anger are more similar to the Stoic ones. While it does arise naturally, they view it as one of the root "kleshas", a negative emotional state that can cloud the mind, and lead you to bad actions. That's why for them, the key aspect for improving you life was to learn how to control this anger.
And thanks for taking the time to write such a lengthy comment. Always good to reflect! I believe that each person is different, and everyone needs to fit their own best personal strategy towards the challenges of the world. That's why I usually try to share "solutions" from different perspectives (some of them can even be contradictory sometimes).