Why does this keep happening?

Yesterday, a gunman killed 19 children and two adults at an elementary school in Uvalde, Texas. Today, we revisit a story on gun sales we published after the 2012 Sandy Hook shooting in Connecticut. If it feels like nothing has changed since then, that’s because when it comes to buying guns, nothing has. Later in the program, a look at our aging port infrastructure and a visit to rural Oregon, where mobile home parks are struggling to rebuild after  wildfires.