Ok, its just you don't need to keep hosts alive for long to be a humanity killer. The black death killed in under 40 days. Sometimes in under 24 hours. Like ebola its tactic is to fell its victim and then infect scavengers as the juices and liquids seep from the rotting victim. same game, different tactics. I think I just lost the thread of your argument.
Behold Thork, having encountered someone who, for some reason, agrees with him, he quickly manages to find some tiny disagreement to keep himself afloat in a world of hatred.
We agree that ebola isn't a pandemic type disease.
https://en.wikipedia.org/wiki/List_of_Ebola_outbreaks^History tells us that.
Compare how fast the common cold spreads compared to ebola. If the common cold was a killer, people would have ceased to exist a very long time ago. Everyone has had a cold at some point.
And that's by and large how viruses work. If they infect lots of people quickly, they tend not to be killers. If they are deadly they either break out very rarely or do not have much impact.
Ebloa breaks out regularly and is deadly. Ergo, its not going to spread. Nature is pretty good at balancing things like that. You might argue plague spreads fast and kills, but it doesn't do it every few years like ebola. Any virus that kills everything it touches isn't going to have anything else to live off. So it will cease to exist and ... they don't.