It is not fair that people who are born in the UK to parents who are domiciled here, can later in life claim to be non-doms and live here, it is not fair that non-doms with residential property here in the UK can put it in an offshore company and avoid inheritance tax.
There should really not be anything gratuitous in a work of art. Sometimes what seems as if it's gratuitous may be a passage in which a character is being characterized so that the reader comes to know him or her better.