I don't trust self interest.
Especially not in my butcher, brewer, or baker. Pure self interest gets you McDonalds, Bud Light, and Debi cakes. I consume exactly none of those things and have no desire to consume any of those things. They taste terrible, are bad for me, and the companies themselves are generally bad for their communities and the world.
A good butcher, brewer, or baker is driven by craft first - care for their product, care for their customers, and care for the environment. They devote themselves to their craft. Not out of self interest ("I'll make more money if I do it this way.") but out of sheer joy of craftsmanship and doing good.
I have known few producers who's products I would rate trust worthy who weren't driven first by craftsmanship, care for their customers, and care for doing good in the world. Self interest (of the "I need to make a living" form, not the "I want to be rich" form) in these situations is consistently a secondary interest. For these crafts people, if they can't meet their self interest, they simply stop crafting rather than pollute their product.
That's who I trust. Never the behemoth driven by fiduciary duty and self interest.
Adam Smith's philosophy is nearly 250 years old and predates the modern industrial revolution. It's time we stop putting it on a pedestal. We've learned so much about the way people, markets, society and people in markets and society function that he simply had no way to know.