I'd say they're correct, but it's still wrong to litter, fail to recycle, go on long-haul flights when more carbon-friendly alternatives are available, etc. Stealing a $100 item from Walmart isn't going to make a significant dent in Walmart's pockets. Killing a single person isn't going to have a sizeable impact (they're just 1 person on a planet of 6 billion). Yet most would consider these acts (and many more besides) wrong. Though of course there are degrees of wrongness.