Re: I'm not even worried about hackers
So Mr Upstanding Police Chief has their back door.
Mr Evil Hacker puts on their black hat and steals it from Mr Upstanding. It takes them a few days to get it, perhaps by applying a brown envelope or rubber hose to Mr Upstanding or their staff.
Next, Mr Evil sells it to the highest few bidders. Who sell it on to the next-highest.
Within a few weeks, every script kiddy in the world has a copy of said back door, several criminal organisations have a new income stream and the body of Mr Upstanding's private secretary still hasn't been found.