Those other pandemics are before we had any ability to defend ourselves or even know what was going on.
SARS-1 and MERS are quite fatal too but we stopped them from spreading.
> Those other pandemics are before we had any ability to defend ourselves or even know what was going on.
Yes, of course. And I'm simply adding that Covid-19 would be nowhere as bad as those even if we had no ability to defend ourselves.
With that out, the Covid-19 pandemic, even without any measures at all, was still incredibly mild. Wikipedia says 0.1-0.3% global population lost [0]. It would have been I don't know, perhaps 0.5% without measures? Compare to the other pandemics on that list, you routinely see ones that wipe out 20-50% of the regional population - now that is significantly bad.
[0]: https://en.wikipedia.org/wiki/List_of_epidemics