I ultimately don't really care why the OP wants it before others, I believe that the best way to protect everyone (old folk included) is to cut the pandemic at its most potent vectors - in other words people that are forced to come into contact with many other people. If the virus is able to reach the vulnerable, we have already failed. You're right in that some other outsider might bring in Covid to the nursing home, which is why I don't think that people should be visiting nursing homes during this time, unless it is absolutely critical (like life or death level emergency)