The virus isn't going to hit some less healthy person just because some young person didn't get it. The opposite is true. The virus will eventually hit everyone, and most people can slowly build up immunity as we wait for vaccines. Delaying that inevitable infection is bad for the virus. But delaying it by destroying the economy is not good for anybody.
“The virus will eventually hit everyone, and most people can slowly build up immunity as we wait for vaccines”
I 100 percent agree with this. Which is why it makes no sense to remove healthy people who have a better chance of recovering and gaining immunity from the population. While they are sequestered the virus still finds hosts.