perhaps one idiot will toss your package somewhere on it's path to you, or it is squeezed between a couple other big heavy objects and become broken
Did you seen, how Russian Post Service dealing with packages at sorting facility? 
http://www.youtube.com/watch?v=QfkGoYfbLdE
you don't have to go to Russia to get crappy service:
http://www.youtube.com/watch?v=cpVFC7bMtY0