They aren't only like this from inbreeding, this happens in the wild.
Some cats carry a special 'white gene' and if both parents have it, the offspring will be white. It is a mutation. More cats have it in captivity than in the wild, but it can occur in the wild. It's like albinism but only the orange part of the fur is white (they aren't related, both mutations, but they both involve color in the fur and melanin and such). In some cases the stripes can be white too.
There are also 'golden tigers', which have orange fur and darker orange stripes. They look pretty cool, but there aren't many of them I believe.
While white tigers are pretty, I think inbreeding them to be like that is wrong. If a tiger is born naturally like that in a zoo, that's cool. But selectively breeding them so they turn out white for zoos? That's not right, even if it is just fur color.
I know that it's transfers genetics maintained by the Man, that it's congenital and that consequently, many are born with deformations. But they are present in zoos and I'm not going to hesitate to photograph them. I shall not complain if there wasn't and if they were replaced by tigers of sibérie or Indochina (with the aim of protecting them and in a purpose of forward reintegration)
I like the shot a lot. I kind of want to see the shadows cranked down (made darker) a bit, while you use a graduated filter in lightroom to keep the top and top/right from getting too dark. I think it might add some clarity and realism in the very light parts of the tiger and rocks which look a bit surreal. Just my two cents. I like the shot, and love the look on his face.