Trader Joe's has terrible produce and meat with a short shelf life. Too many times I've bought rice and boxed pasta that contain dead bugs that float to the top when boiling.
I don't buy produce and meat from TJs, because local supermarkets have better deals. I just buy dry/frozen goods from TJs, and have yet to experience what you did, shrug.
Multi-stage milling usually get rid of that. If you're shopping organic you should be happy about the bugs, unfortunately.