You say this like human beings haven't been dealing with virii for hundreds of thousands of years. It wasn't that long ago that human societies had to deal with smallpox, you know. And smallpox is a disease that kills the young, disfigures people in their homes, wipes out entire families - this is the reality of the human experience. You can do the liberal "chain" for virtually anything if your goal is to shut down peoples' abilities to live their lives. Like, people do get hit by cars walking down the street - we don't use that a justification to ban cars. I'm sorry I don't buy it.
Old people in nursing homes die. Ask anyone who works in a nursing home. They often die because they contract a contagious disease that finishes them off, because their immune systems are very weak. It is understood that this can happen, and while reasonable precautions can be taken and are taken, it's not foolproof. If you're telling me we need to shut down our economies, take away the ability of healthy people to feed their families, and enter a great depression because 80 year olds with COPD need to be protected, I have to ask why we don't do this all the time, because the truth is, these people are very vulnerable to contagious diseases going around 365 days a year.
As I said before, if the standard is "no new cases, ever", then the government needs to board up all of our houses and let us starve to death in our homes, where we cease to be a dreaded COVID-19 transmitter.
