Destruction of a Time Lord
When you exterminate a time traveling race (like the Time Lords or Daleks) what does it mean?
Sure it's one thing to trick them into blowing up their own sun at such and such a date. But, what about the people away from home at the time? What about all the time travellers roaming around?
Somehow, all of the Time Lords (and most of the Daleks) anywhere and anywhen have been annihilated. Talk about a butterfly effect!
What about earlier incarnations of the Doctor?
Actually, I got the impression that the Time Lords mostly sat around their council chambers debating possible threats to the timeline and, upon discovering one, co-ercing renegades (Time Lord who refuse to sit around their council chambers debating...) into fixing the problem.
There were at least three renagade time lords beside him: the Monk, the Master, and the Warlord (whom I suspect was the Master before anyone thought to call him that).
In the "Trial of the Timelord" season, we learn that the motivating character, a masked Timelord entitled "The Valeyard", was in fact a future "evil" incarnation of The Doctor. Just why he was persecuting his earlier self, I've forgotten (if they ever said). But the net result was the revelation that the Time Lords had been plotting to secretly destroy Earth in a way that wouldn't be traced to them.
Again, I don't remember an explanation of why.
So, maybe the Valeyard wasn't so evil after all?
Neither incarnation 9 (Eccleston) or 10 (Tennant) of the Doctor seem all that stable.
Yet, #9 was still unable to bring himself to destroy an Earth in the far future to finish off the remaining Daleks, even given his own argument that humanity would survive through all its colonies.
What's my point? I don't know. I just suddenly had to vent.
Gorgya