Using the hypothetical 200 in a nursing home environment example, the caregivers that regularly leave should be immediately vaccinated but then also continue wearing masks, distancing where possible, etc.
Residents would take the same distancing and mask wearing precautions where possible, and get vaccinated as soon as possible after the caregivers.
Visitors would be limited and forced to follow all precautions as possible if any are even allowed on property.
There is no intent to leave the residents to die, no malice, no 'saving on healthcare costs', etc; however with the residents being isolated away from the majority of folks whom can spread the virus, and those that are in contact are vaccinated and following precautions to further mitigate the risk.
The front-line retail worker example plays into how complex the decision making is - theoretically the caregivers are also vaccinated as critical workers, but that doesn't mean any contractor (maintenance), cook, visitors (if any are allowed) or delivery people (mail, bulk items, etc) also could be vaccinated first. Assuming they're all following the necessary precautions, a further mitigation point would be to vaccinate their more regular points of contact such as the front-line retail workers whom could easily contract the virus and then spread it while being asymptomatic until they're either tested or they fall ill and start receiving treatment (assuming they're financially comfortable enough and their employer doesn't make it hell to get the time off - most low-level retail employees can't really afford to lose the income from what I can tell).
Obviously, full vaccinations for everyone as part of a well-organized swift rollout would be preferred, but since we aren't even close to that yet this is the kind of thing we have to deal with.