Former barista here, it's definitely the barista.

Though to be fair, the blame is mostly on the shop owner for not emphasizing quality and training the barista well

You can't seriously be equating the moral shortcomings of taking a bribe to the complete immorality of imposing a draft on others and forcing them to march towards near certain death

Oh no! Won't anyone think of the criminals!?

It's also done to increase the shelf life of the beans. So if you get Starbucks coffee, there's a good chance you're drinking coffee from beans roasted years ago. As someone who exclusively drinks specially coffee, the thought of drinking coffee from beans that were roasted even 3 months ago grosses me out