You know, that kind of got me thinking. As much as we'd lile to save every betta from abuse and horrible conditions, we can't save every single one in the world. Really, IMO what we CAN do is set a good example by taking good care of our own fish and by informing others (nicely) about the proper care of bettas. All running into a store and going into a screaming tirade is going to do is get you in trouble.
I think that a lot of people take everything a bit too hard. I mean, yes, it's horrible, but foaming at the mouth screaming at employees isn't going to help. I actually have family that works at Walmart, although I don't know if that particular ones carries fish, and I know that they're given their own tasks and probably would be fired for changing fish water when they are supposed to be stocking shelves. If you have a problem with it, take it up with the person who's in charge with everything, and there's still no need to get rude. Many people aren't aware of the care a betta needs, and unless they're going to get one, they shouldn't have to. You can politely inform them, and maybe they'll change it. If they don't, just go shop somewhere else. By screaming and crying and carrying on, you're just making yourself look bad.