Keeping the elderly from contacts isn’t as simple as them staying at home!
My parents are in their 90s. They are still living at home. They both have walking frames and are frail and elderly. They both have carers who visit them each day to shower them, to clean their home, to do the grocery shopping (neither of them can lift much more than a kilogram, so getting groceries delivered isn’t enough - it needs to be put away), and the gardening. So they have a constant stream of interactions, just to live.
The carers aren’t the same people each day, and they go from home to home assisting elderly people like my parents, but also shopping for them, so they also need to interact with others in the community to do their jobs.
My parents also need to see doctors, pay bills (they don’t have credit cards, and are unlikely to be able to learn to use them now), and get things repaired. They can’t change light globes because they’re not nimble. They try to use their computer, but it constantly stops working (for instance, the keyboard drops and the batteries fall out, so they put them back in the wrong way round because they can’t see the diagram very well, so the computer stops working), so they need someone to come and fix it.
They are far better off in this arrangement than in a nursing home. We all live in Australia, where we haven’t had the enormous numbers of people dying in nursing homes (although a couple of our nursing homes have had outbreaks), but even here, the elderly with home care (like my parents) are less than half as likely to get covid19 as the elderly in nursing homes.