No.2230
What exactly was stopping the doctor from just going to new york and picking them up?
Even if it was 5-20 years later, that's better than "welp they're basically dead now"
No.2241
The fabric of time had already been damaged enough, so the Doctor doing that could have just made it worse.
No.2259
Wibbly Wobbly Timey Wimey the timelines are all screwed up or something
Basically there is no reason, but don't think too hard about it and just enjoy the pretty colours. Look! The Statue of Liberty is an Angel! Wowzers!