Please help me explain to my neighbors how the stock market's serious illness can affect " people who do not have stocks ".

My grandparents were destroyed by the depression. In 1928 they had a velvet couch and jewelry and jobs: By 1933 they nearly starved. I live in an area that worships Mr. Trump. I quietly do not. They really just say ignore TV and the TV news.
I am the low income, disabled senior in a gentrified small town. All of them like me, and insist I will not lose Social Security, Medicare and Medicaid. I am terrified, and I do not understand how these people can be serene. I also do not know why they feel the stores and banks will be unaffected. Thank You for your reply.