The reason viruses like smallpox were eradicated is because they don't have an animal reservoir, whereas coronaviruses do. The problem with scientific arguments is most people don't understand what they're talking about (including me, not trying to sound rude). I had to research to understand why small pox vaccines were effective, bc we literally eradicated it.

Similarly, this would be like treating all vehicles the same, but some vehicles are cars and others are boats. They're part of the same family since they're both vehicles, but they have distinct characteristics that make them operate differently.