Howling:Two "fixed deaths" for the eleventh, how does that make any sense ?

Greetings! First of all, I apologise for my english (not my native language), but I will do my best, and I thank you by advance for your patience. I'm quite a slow mind, and since I am not a huge fan of Moffat's era, I have difficulties to "stay hooked" to his stories; nonetheless, I have been watching series 6 and 7 again and again, trying to understand more about the "Silence's plans". In fact, several things don't seem to have any sense to me, so I have been searching for explanations here but in vain:

1. How could the Silence create another fixed point in time where the doctor dies? If Trenzalore is the place he must perish, I don't understand why they even tried to change that fact: by trying to alter the "Trenzalore fixed point", Time should have been desintegrated the same way it had been when River Song refused to "kill" the Doctor near the Lake in "the Wedding of River Song".

2. Beside the fact that the Teselact faked an attempt of Regeneration (which doesn't seem very consistant from my point of view), how faking his death change a fixed point? If time is desintegrating because he doesn't die, how could it possibly be different after he still doesn't die but only fake his death?

3. Unless the fixed point (22 April 2011, 5:02pm) was not about the death of the Doctor but the fact that people must believe he's dead, and even that way, how the Silence, which knows about Trenzalore, can be deceived?

4. I'm not found of the "time can be rewritten" magical trick which is hammered so many times during Moffat's era, but assuming it's a fact: if the Doctor really died near the Lake Silencio, Trenzalore time and facts should have been rewritten as well, or am I getting wrong on all this? If I'm right, the Silence should have noticed it and known that they failed in their attempt to kill the Doctor earlier. As you see, I'm so very lost in all this wibbly-wobbly timey-wimey stuff, and I don't find consistant answers or even satisfying interpretations of those stories, concepts and facts that just seem to contradict themselves from my point of view.

Tepec ☎  12:33, November 5, 2013 (UTC) Tepec