I don't understand how this conversation is still ongoing. you are comparing someone willingly taking unwanted fish in and killing them because they don't have room for them to things such as 1)a breeder culling offspring for undesired traits, 2) feeding feeder fish to predatory fish. 3) culling bettas for color. . . . its not even close or ethical. so let me understand this, because theres a worse option thats possible, we should just pick the best option in front of us and not question it or hold ourselves to a higher standard?? thats insane. just like anything else in life our hobby is a supply and demand business. and just as our hobby has done to several negligent pet stores, we can stop this kind of actions by simply not feeding into it. because I consider myself to be a responsible adult, if I decide to quit the hobby and sell off everything I have in it, I make it my sole responsibility to properly rehome my fish, not unload them on anybody with free tankspace. these fish depend on us, they literally have no control over their lives. so its our responsibility to ensure their healthy lives. point being, if you don't want a fish, or don't have plans to properly care for them, don't take them in. simple as that