I don't think it's really so straightforward. Not everyone in a care home is at death's door. In high dependency units there is probably quite a low life expectancy. Yet someone in a residential care home, who needs care with day to day living but does not have an acute medical condition, may live there for several years. Likewise someone in a nursing home with low to medium dependency, or with dementia etc., can live for several years (albeit horribly so in the latter example). They may still be generally weaker and more medically vulnerable than those not in care homes and therefore more susceptible to the virus if not properly shielded from it, but not necessarily in the "oh, they were old/infirm and going to die anyway" category.