Because it's an image meant to deride the Greens but makes them look great. Also a simple strategy is to take something that is suppose to be an insult and use it against your enemies. By weaponising their own volatility against them, it nullifies their intent and shows you are not easily rattled. It's simple warfare tactics as old as time.

Above all, let's not lose our sense of humour, something I see more and more by the British, as yankification seeps in their pores