i can see why you might be upset, but as the others have said, really it's for the best. there are SO many unwanted poor little piggies out there needing homes, yet many, many people will not even think about rescuing. it would be good if all shops stopped selling-but as daftscotslass said, it's not going to happen is it? they will just sell to anyone who wants a piggie, and whilst there are good owners like you out there, there are probably at least twice as many who aren't. and shops aren't going to turn away custom are they?
i think everyone should rescue, i didn't before i knew, but i would definitely now, however there isn't a rescue devoted to piggies near me, and the RSPCA don't have many piggies usually, but there are so many unwanted piggies out there, even young babies, i wish everyone one would. Plus, rescues make sure their piggies are going to good homes, where they'll be cared for like they need. i think pet shops should at least have to do that. i understand why you're feeling sad, but try and see it as a good thing and i bet in the future you'll feel great for rescuing. the only problem would be if there isn't one near, but you could cross that bridge when you come to it O0