A mid-ranking Chinese Foreign Ministry official tweeted a fake image this week of an Australian solder killing an Afghan child. In less than an hour an angry Scott Morrison held a press conference to condemn the outrageous slur and demand an apology. It sparked a week of debate about whether China had over-reached and damaged itself or achieved exactly what it wanted with this Twitter bait. And whether the Prime Minister's fire-up was appropriate or better left to someone more junior. All legitimate questions, but the big one that remains unanswered is what, if anything, can be done to stop this broken relationship going from bad to worse.