为什么有时候需要“let sleeping dogs lie”?

Let Sleeping Dogs lie -Don't wake up the baby after I just put him to sleep, let sleeping dogs lie. -No need to bring up the fact that he broke the lamp three years ago, just let sleeping dogs lie. -I didn't want to talk politics at the dinner table, but then just couldn't let sleeping dogs lie. 【Definition】 do not disturb a situation as it is - since it would result in trouble or complications 【Etymology】 This injunction to avoid stirring up trouble was already a proverb in the 13th century. It alludes to waking up a fierce watchdog and has been stated in English since the late 1300s. Other examples: 1. She knew that she should let sleeping dogs lie but could not help talking about her unhappy relationship (marriage) again. 2. Don't ask your son to look for girlfriend again when he comes back for Spring Festival reunion. Please let sleeping dogs lie.