After 9/11, a lot of people avoided the subways or going to terrorist targets like Times Square, but life outside of the immediate area around the WTC continued, and even the World Series was played in the Bronx shortly after. 9/11 had a terrible impact, but things returned to almost normal much more quickly than they have with covid-19.
I haven't really had that experience until the last few months. Its just as surreal now as it was then.
There are a few dozen wars, civil wars, and genocides over the last 70 years that resulted in more than half a million deaths. Plus of course much non-death related suffering. Afghanistan, Iraq, Iran-Iraq, Syria, Sudan, Rwanda, Ethiopia, Congo.
Plus some real stand-outs, like the Korean War (2M - 3M?), the Vietnam War (1M - 4M?), the Khmer Rouge mass killings (1.5M - 2.5M?), Nigerian Civil War (1M - 3M?), the Bangladesh genocide of '71 (500k - 3M?),
In the natural world, cyclone Bhola (and subsequent flooding) is blamed for over half a million deaths.
As it stands, COVID-19 isn't even in the top 20 yet (er, bottom 20?), though unfortunately it is on track to perhaps hit top-10.
For reference, WW2 is still two orders of magnitude worse than any of the above. Yikes.
AIDS has killed 32 million people. It killed 1 million people in 2016 alone.