Was there ever a reason given for Harry breaking The Elder Wand in two and throwing it away, before even repairing his own wand, contrary to the books, wherein he confers with the portrait of Dumbledore and they decide that after Harry mends his old wand using the Elder wand, he'll bury the Elder Wand in Dumbledore's tomb so that if Harry dies a natural death, the wand's ownership never passes on to anyone else.
Doesn't the end in the movie dispute this ? Additionally, if wands can simply be repaired ('Reparo'), couldn't the Elder Wand as well be repaired by someone who discovers its two pieces ?