Christ...
There is no immunity because this is a novel virus that attacks the respiratory system and his highly contagious. Most people can stay home and ride it out, but by the onset of symptoms they will have already have infected 2-4 more people. The problem is when ICU's are overloaded. You can 3-D print as many ventilators as you want in as many makeshift hospital rooms in hotels as you want, the real problem is the lack of ICU doctors you need to treat these people. So then hospitals are asking ER doctors, pneumologists ,residents and other specialists to step in and effectively take them away from their regular work to take care of the high influx of people coming in with severe respiratory issues. Then what about those non covid patients showing up at the ER from a car accident, head trauma, gun shot wound, asthma attacks, stroke etc who might not be able to see a doctor because some ER docs are in ICU to give the ICU specialists a break. Some of these cases that would otherwise be saved, are now dead. The Covid mortality rate is one thing, but its ability to infect a fuckton of people in a short amount of time putting serious strain on all of health care because many of them WILL require hospitalization. This isn't just people with the sniffles going on ventilators. People with sniffles are properly triaged. This goes beyond all of this, and your oversimplification of the situation is precisely why your country is going to possibly suffer a fate worse than Italy's.
