I have been watching a good British drama (Downtown abbey) and this sentence is from that drama.
It is from a dialogue between a servant who is waiting for his dismissal and the head of the servants(Mr.Carson) after a dinner. So, the servant is worried that he will be fired and is asking questions to Mr.Carson trying to find out when -or if- he will be dismissed from his job soon.
Here is the whole of dialogue:
The servant: Mr Carson, I don't suppose there's any more news on when you'll be serving notice?
Mr. Carson: Nobody's going to be flung into the road, I can assure you.
The servant: No, but I mean... should I start looking for another job?
Mr. Carson: How could it hurt?
The dialogue ends there.
And I really can't understand what does Mr. Carson means by saying "How could it hurt"?
I have searched for the sentence on the Internet thinking it might be a phrase or a proverb, etc. But it seems it is not.
Do you know what does "How could it hurt" means here?