Arizona presents no specific reason for excepting capital defendants from the constitutional protections extended to defendants generally, and none is readily apparent.
I can analyse the trajectory of my popularity and find out why the peak was a peak and the valley was a valley - grapple with it that way - but I prefer not to analyse it that much.
If leaders in the space program had at its beginning in the 1940s, pointed out the benefits to people on earth rather than emphasizing the search for proof of evolution in space, the program would have saved $100 billion in tax money and achieved greater results.