I wouldn't consider it stealing. I hate moldy berries

, but I probably wouldn't do that myself. I do try to look at them closely through the packaging to make sure they're in decent shape. Love really fresh fruit! But a pp was right - if it was a Farmer's Market you wouldn't pick out rotten fruit, you'd only pick and buy the good pieces.
Just because it's pre-packaged, should we have to buy ones that are rotten? If I really wanted to only get good ones from pre-packaged portions, I'd probably - having worked in a supermarket myself for years - work with a produce clerk to sort through the packages, but I wouldn't just open them up and do it myself, leaving all the rotten ones there, lol, and I wouldn't overfill the package, that seems wrong. I wouldn't say I'm completely against it, though.
I was in Whole Foods recently and this woman came in and started tearing all the grape packages apart like a madwoman, seemingly having no awareness whatsoever that everyone was staring, even the produce clerk working the aisle, who went over after she left to clean up the mess she'd made. She wasn't outright wrong, but the way she went about it was off-putting.