Howling:Mankind protected by the Laws of Time?

Hi, I'm a big fan of the new Doctor Who series, and between episodes I've had a lot of time to think about certain things, and I've come to a conclusion that I would like to hear the opinions of others on:

We know that there are fixed events in time and space, events that "must happen", and according to the Doctor, must happen in a particular way, and as we've seen, any attempt to alter these events simply causes time to work around the alteration. (Evidence for this is the fixed event featuring Captain Adelie Brooke.

Now, we know that Captain Brookes death was a fixed point in time, and even though it needn't have happened on Mars, or the Mars base, it had to happen roughly within the context that it did (she had to die so that she could inspire mankind to explore the universe, I apologise if this is wrong, I can't quite recall the exact reasons.)

Now with that in mind, does this mean that since Captain Brookes death within this context is fixed, does that mean that the human race as a whole, is protected from any genocidal attempt that would wipe out the entire human race (or at least a large portion of it.) Particularly Captain Brooke's family blood line?

My reasoning behind this theory is thus:

1. Captain Brookes death is fixed in time. It must happen.

2. If the human race were to be wiped out, or significantly damaged, this could alter history in one of the "in flux" moments, possibly resulting in the stunting of mankinds technological progress. Or possibly wipe out Captain Brookes bloodline.

3. If this were to happen, then the fixed point in time concerning Captain Brooke could not happen.

4. Captain Brookes death within it's context is a fixed point in time. It *must* happen.

5. Any events such as the genocide of the human race, or detrimental effects to the space programs must be circumvented or rewritten by time itself in order for the fixed event of Captain Brooke's death to occur.

I would very much like to hear the opinions of my fellow Who fans on this matter, so without further adieu: Discuss =D

62.255.129.104 18:41, June 3, 2010 (UTC) Anonymous, 3rd June, 2010, 19:41 (GMT)