Anyone who passed Biology 101 should be able to figure out what, without a cure or a vaccine to a very contagious disease, that any open gatherings of people is going to result in mass contagion.
That said, like trying to pass highly restrictive airport security measures on September 10th, 2001, people won't accept harmful changes like a shutdown without fully understanding the alternative. Obviously those supporting opening up and protesting to open do not understand the consequences of their actions. Fine, let them find out.