JERRYSTINGER...
On the contrary,as the first people most pax come into contact with at their destination,Customs Officials most certainly should present a positive image of themselves as they are often the first impression of the country in question.
You try coming up against some arrogant,half-educated,stroppy lout after a twelve hour or longer flight,and having to explain yourself like a criminal when the only misdemeanour you've comitted was making the bad decision to come and spend your dollars/pounds/euros in their country.Not a pleasant "welcome".
But then again,you're taking the usual "govt department' view,that they're not there as a service,but as an obstacle.