This discussion is framed very weirdly, almost to the extent of meaninglessness because the language is so imprecise. Asking "is hacking good" is like asking "is evolution good for people when it produces everything from terrible worms that blind people by living and eating their eyes to fantastic bacteria that allows us to digest all kinds of crazy foods?"

Systems always have weaknesses and systems always change. Sometimes we improve the weaknesses for fun or profit or usefulness, sometimes we attack them for fun or profit or malice.