Most people cannot think exponentially (or logarithmically). They might know the concepts, but still, for the most part, think linearly (like, it killed 2k in 3 months, how bad can it really be?).
It is also the reason why some people started panicking when they saw the number of deaths reaching a few hundred per day when in all likelihood, that was only the start and it was going to get much worse before was going to get better. Heck, even now, it is going to get much worse before it gets better (and then it might get worse again when countries start relaxing the constraints they have put).