Would I actually do this? No, mostly. If I happen to see something useful on top of a dumpster or trash can, or next to either, then I have no problem taking it. However, I am careful to be sure that nothing gross was touching it, and I can’t ever imagine getting into a dumpster.
Why? Well…I am a bit of a germiphobe. I don’t like yuckiness, though I don’t mind playing in the dirt and composting. Go figure.
Anyway, I see nothing wrong with other people doing this. You may want to make sure that it is legal in your area first, but I do believe that there are many freegans in many places who probably don’t care if it is legal or not. I saw a show once where people got a bag full of perfectly good food at a bakery or some sort of restaurant. The stuff is thrown out separately from other trash. And it was free.
Here are some sites for your reading pleasure: