Why does the Doctor favor and protect Earth, as he is a Time Lord and not from Earth? Is there any canon explanation?
Answer
There are a couple of other explanations: - in the TV movie the Doctor states that he is half human on his mother's side. So thus if that is true and his mother is from Earth's future, then by protecting Earth he is simply ensuring his own survival.
IIRC, in the Doctor Who RPG, it is also stated that the Earth is a "temporal nexus point", meaning that changes on Earth have bigger effects on the wider universe, although it is not really explained in any more detail.
And an additional one - we know from episodes like "The Doctor Dances", that the human empire eventually spreads out throughout the entire universe. So destroying the Earth before that happened would leave a void which could be filled by another race.
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