Walmart has always been considered essential, which has made it the most popular argument for people who didn't think the things they wanted to do should be prohibited. "Why can I go to Walmart, but not the gym?" "Why can I go to Walmart, but not get my hair cut?" "Why can I go to Walmart, but not eat in a restaurant?" "Why can I go to Walmart, but not a concert or indoor sporting event?" Why can I go to Walmart, but not WDW?" They've also used the grocery store to a lesser extent. The comparisons have never made sense, because we need groceries to live. None of the other stuff is essential to life. It's simply an attempt to justify what people want to do.