Although, the cackling high voice in the TARDIS when it blew up is still very different to the hoarse voices of the Silence creatures.
It's not so much that. It's that, if we accept the Vampire thingies, ran from the
effect (Silence falling prophecy) then this spelt the end for that race. If it was the end for that race, then it must the end for a lot of races - including the Silence. So whatever they do to stop the Silence falling should benefit other races and that makes them sort of good. Makes them out to be protectors trying to ensure something bad doesn't happen - further verified by the fact that it's a religious order which has come together with Kovarian involved as well in some fashion. There's been an awful lot of religion going on with the Clerics and Headless Monks...
But that's if we're going on the assumption the Silence falling is a bad thing for the, well, Silence. But then the plot would feel very much recycled from series 5 where there was special organisation to
stop the Doctor (in this case, asking the Question?) doing something or ending the universe or making something happen. Furthermore, the way he dealt with the Silence in Day of the Moon sort of lessens the impact of The Question - provided we believe it is bad for them. Being killed so fast by the Doctor's plan should have been equally bad for them. It seems whatever it is
is greater than their own survival.Curiously, a few things about the Silence is that they are parasites, have been on Earth for hundreds of years, have their own ships which are like TARDISes, have some form of technology which they used on Amy's wedding to control the TARDIS and ultimately cause it to explode.
So whatever this Silence Will Fall thing is, if we accept the opposite and take it to be some evil plan, it has to be worse than the universe blowing up?
The Question stuff seems misleading. Obviously asking a question won't make something mad happen. Perhaps it depends entirely on who you ask the old, hidden in plain sight, Question
to. Like a figure like the Astronaut who is right bang in the middle of a fixed point in time and space.
Anyway, I don't think it's possible to speculate more given what we've been given. Essentially nothing.