It means that even it everyone is doing something wrong, it is not right. It is referring to peer pressure, don't do something just because everyone else it doing it.
The best government is that which governs least. No human depositories can, with safety, be trusted with the power of legislation upon the general interests of society so as to operate directly or indirectly on the industry and property of the community.
Answer:
The background knowledge that when he was treating humans and kept pets, people stopped coming to him for treatment and he became poor.
Explanation:
While reading the story, Sweet T must have read of the time when Doctor Dolittle was treating humans and kept a lot of pets. People did not like the animals and they soon stopped coming to him for treatments. He began losing money and soon became very poor.
This background knowledge would help Sweet T make the inference that since pet owners were scared of bringing their sick pets to Dr. Dolittle, he would be losing money and would soon become poor again.
