Everyone in the USA will get C19. So what's the argument here? They will overload the hospital system? The very few (at a university) who might die, might ge

Everyone in the USA will get C19. So what's the argument here? They will overload the hospital system? The very few (at a university) who might die, might get a extra year of life by the university lockdown for longer? Where they wait for the non existent vaccine or treatment (many years away at best)? Do they have an actual exact reason other than a wishy washy fear? What mathematical model do they hope for by delaying?