Time travel : what does Ron know

[vmonte]

No: HPFGUIDX 88985

vmonte:

DD knows everything Ron knows.  That doesn't mean that he can force 
people to behave the way he wants, or that his plans to save people 
in the past will always work.  What is key is that DD is trying to 
manipulate events in the past. Unfortunately, when a change occurs he 
then has no previous knowledge to work from.  

Let's say Sirius was originally killed before the fight at the MoM.
DD changes the past and saves Sirius. Now the timeline has changed 
and he no longer knows what will happen next, regarding Sirius. 

Even if DD is capable of saving Sirius, he cannot force Sirius to 
behave the way he wants him to.  DD changes the past but Sirius dies 
anyway because Sirius is a grown man who will make decisions that are 
independantly based.  

I think DD did try to save Harry's parents, but he couldn't.  Let's 
say that in the original timeline Lily and James were killed even 
when Sirius was their keeper. Ron goes back in time and knows this 
and perhaps inadvertantly causes Sirius to remove himself as keeper.
Ron (DD) may have put extra pressure on Sirius and it may have caused 
Sirius to distrust his ability as keeper.  Wormtail becomes keeper (a 
new event unknown to DD) and the Potter's are killed.

Why would Ron let Ginny be a victim of Tom Riddle? Why didn't he get 
rid of the CoS when he knew that it was going to happen?  Because he 
knew that no one would get killed. And perhaps Harry needed to go 
through this experience to prepare him for a future event.  It is 
also possible that Tom Riddle inadvertantly caused Ginny to become a 
stronger witch, and she too will benefit from this encounter. 

vmonte