Re: American citizenship and second wife.
I guess life is too demanding and too complicated for some folks.
Based on what I have seen , this guy gave in to parental pressure because his sister was getting old sitting home for lack of some reasonable rishta. Those other folks were desperate and were under pressure too because theirs was getting old too for lack of rishta. Everybody thought that they are all just helping each other out. 
Pakistan is 6th most populous country in the world for a country smaller than the size of Texas , too much too deal with for everybody there.