Because they're more concerned about trying to live, rather than in posting tweets.

My mom (89) told me about growing up and polio scares. She remembers going to school and across the street was a girl who was in an iron lung. They had it set up near a window so she could see outside. And Rold Dahl had a daughter die of measles. We should be grateful for these advances.

My mom grew up in the 40s and told me about a girl who was in an iron lung. Why would anyone want to return to such times?