This is not entirely true. E. coli can produce heat-stable enterotoxins that will still make you sick even after cooking/killing the microbe. Probably best to toss or at least wash them before using.
Edit: assuming they're from one of the listed brands and match the recall window.
For the most part, but definitely not everyone. Many people lack awareness about where food comes from in general, not to mention basic food safety practices. It wouldn't surprise me if folks who mostly buy prepackaged produce and know little about farming would assume their produce is clean enough from the store.