We went from "public shaming is acceptable because those who have done/are doing wrong should feel bad," to "if you are not 100% sensitive to others feelings you should off yourself."  When photos/video began 100+ years ago there were no fat people.  We all know the reasons why and although our lifestyle can be less physically challenging we make a choice to become less physically active and eat poorly.  No one is forcing anyone else to eat another ice cream bar.