What you’re saying tracks with the article as well:
Charlene Harrington, a professor emeritus at the nursing school of the University of California-San Francisco, said: “In their unchecked quest for profits, the nursing home industry has created its own problems by not paying adequate wages and benefits and setting heavy nursing workloads that cause neglect and harm to residents and create an unsatisfactory and stressful work environment.”
From the article, it's likely because they live and work in lower income areas: