Oh lord, Thork tried to do math.
1. You can't use the law of averages on non-normal data. Viral pandemics are the very pinnacle of non-normal data sets. It's also more often than not complete garbage to apply law of averages. In statistics you want to avoid it.
2. You can't use a population growth variance with abnormal parameters. (e.g. Humans are not a natural host to Ebola. Ebola evolved with other animals and became zoonotic). You can't claim that Ebola can't "kill itself off" inside humans because even if every human on Earth is dead it would still go on in other creatures. It has no evolutionary advantage to keeping us alive, unlike, say, the common cold.
3. A virus is not an organism and population growth variance doesn't apply anyway.
4. ur retarted