nursing homes are filled with people knocking on death's door. They have degraded cardiac and lung function, aged immune systems, most are on lots of medications. All respiratory (i.e. easily transmissible) diseases hit nursing homes hard.
Correct. Other "common cold" coronaviruses have a high fatality rate in nursing homes. Realistically there's not much we can do to protect nursing home patients from highly infectious respiratory viruses. Cutting them off from human contact in sterile bubbles inflicts terrible psychological harm.