"A bull in a china shop" is an idiom describing someone who breaks things, makes mistakes, or causes damage in situations that require careful thinking or behavior. It refers to someone who acts insensitively or aggressively, often making a bad situation worse.
Imagine a bull sauntering down the row of a china shop: he barely fits into the aisle, and with every step plates and dishes crash to the floor. Oblivious to the destruction left in his wake, he looks around to see what all the commotion is about, and as he does so, his swinging head takes out another row of china. Priceless, irreparable damage in the span of minutes.
- From online with editing
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Saw this idiom last night while watching "Pine Gap", an Australian TV drama and thriller series about the Australian and United States joint defence intelligence facility at Pine Gap, south-west of the town of Alice Springs, Australia.
Never been a spy nor a "bull in a china shop" myself (hope this is true as I might not be objective enough in self-judgment 
), but I can understand and feel empathy to some characters in the show.
Then when I searched for the news usage of the idiom (btw, there are plenty) this morning, I found a true funny story with the title of "Bull in a china shop? No, it's an elephant in a grocery store", on NBC News.
Here is the link of the story with a short video for a good laugh 
https://www.nbcnews.com/world/asia/bull-china-shop-no-elephant-grocery-store
Have a nice Thursday!
