I think my point is that sometimes "essential" is less safe than "non-essential" and so may not be the best criteria to use. I also think some things that are considered essential are questionable, such as liquor stores.
You are right in that people need groceries to survive, but if I'm going to Walmart how is buying non-essential food such as soda or chips any different than buying a new computer or a desk that might be needed for stay at home work or schooling? IMHO, the safety of the workers and the public should be the primary determining factor as to what businesses can be open. If non-essential businesses can safely operate, I think they should be allowed to do so.