the thing that every virus has done throughout all of recorded history.
This is not true. Measels is just as deadly to an unvaccinated person now as it was when it emerged a millennia ago. Rabies was recorded in mesopotamia 2000 years ago and has a fatality rate of virtually 100%. It is considered, for all intents and purposes, untreatable and incurable.
this; I'd say virus types that spread via breathing tend to mutate into weaker; and virus types that are inflicted via bite tend to be strong, because bitten ones dont readily spread out of human, nor need more effective infecting as they get directly into bloodstream
This is not true. Measels is just as deadly to an unvaccinated person now as it was when it emerged a millennia ago. Rabies was recorded in mesopotamia 2000 years ago and has a fatality rate of virtually 100%. It is considered, for all intents and purposes, untreatable and incurable.
Viruses are NOT guaranteed to get less deadly.
this; I'd say virus types that spread via breathing tend to mutate into weaker; and virus types that are inflicted via bite tend to be strong, because bitten ones dont readily spread out of human, nor need more effective infecting as they get directly into bloodstream