I came across two different idioms, “a law untothemselves” and “each to his own” in the scene then British Army Captain, later a global media tycoon, Dick Armstrong, plotting to rob Julius Hahn, a desperate German press owner of the ownership of his newspaper, Der Berliner in Jeffery Archer’s fiction, “Fourth Estate.” :
Hahn asked, “Do you think there is anything you can do?” “I’d like to, Julius. But as you understand better than most, the American and Russian sector are a law unto themselves.” - P.316
Armstrong placed the dozen bottles of claret on Captain Hallet’s desk before the captain had a chance to say anything. “I don’t know how you do it.” said Hallet. “Each to his own,” said Armstrong, trying out a cliché he had heard Colonel Oakshott use the previous day. – P.318
Wikianswer.com defines “to each his own” as ‘everyone has their own thing and a right to one's personal preferences.’
usingenglish. com. defines ‘a law unto themselves’ as ‘If somebody is a law unto themselves, they do things their own way and follow their own ideas about how to live instead of following what others do.’
“Each to his own” and “a law untothemselves” are very different on their looks in terms of the components of word, but according to the above definitions, they look pretty similar in that everybody has their own rights and preferences, though the former places focus on preference, and the latter on deed.
What are the exact definitions of, and basic difference between “each to his own” and “a law unto themselves”?