Any more deadly (like Ebola) it becomes incredibly scary and people likely do whatever it takes when they see people around them dropping like flies (especially in horrific ways).
Any less deadly (basically the yearly flu) and it becomes easy to ignore and just becomes part of the background process.
COVID is somewhere in between. Deadly enough that hundreds of thousands of people are dying unnecessarily. But can still feel a million miles away for so many people.
This was not a good "training pandemic".