But when the initial statement is about the people actually doing the rotten thing, replying with “it is really the store’s fault” really doesn’t help.

If I hit someone while drunk driving a Tesla, saying “well it is Tesla’s fault for not requiring a breathalyzer before vehicle operation” sounds like it is absolving me of responsibility. Can they install breathalyzers to prevent me from driving drunk? Sure, but I am the asshole in this situation. A store can institute maximum quantities of items, but they are not AT FAULT for people being cunts. They allowed it but to me fault implies that their policies encouraged this behavior. Having a sale on critical items without instituting a limit would be reckless and put them at fault, just selling to cunts does not.