The thing is, whatever you may think of his strutting peacock act, Pietersen does kind of have a point about his dealings with the ECB.
Post Freddie, he is their most marketable player - some would say that in overseas territories he may be their only one. As a result, they feel obliged to play him in every game going to appease home boards and TV rights holders and as such, its not unreasonable that he might feel a little jaded, and a bit hacked off when its seperately deemed okay for Strauss, Broad, Anderson, Swann et al to be rested.
Add in a meaningless series against a Kiwi side shorn of its only two world class players...