I don't think one can claim a "high ground" by saying that delivery is better than going to stores unless one is high risk or quarantined.
Being the agent of someone else's risk doesn't seem better than assuming the risk onesself, unless you feel that a Stam delivery person is less of a risk than oneself.
1. Not that I feel the need to justify my actions for using delivery, but I am around someone who is considered high risk.
2. If stores only did deliveries (as some do) then by nature they would be safer as there would be fewer shoppers in numbers and variety. Fewer people will be exposed which means less spreading of the disease.