[[WMG: Lake Silencio is on top of/nearby the underground bunker in Utah from Season 1's 'Dalek'.]]

Because the Bad Wolf retro-ripple would be a handy explanation for why that part of Utah is primed for a fixed point in time.

[[WMG: The Silence offed Madame Kovarian [[YouHaveFailedMe for failing]], not [[YouHaveOutlivedYourUsefulness uselessness]].]]
This was the Kovarian faction's second ([[TimeyWimeyBall or first]]) big scheme to get rid of the Doctor so he can't reach Trenzalore and potentially start a second Time War...[[EpicFail and failed so miserably]] [[MikeNelsonDestroyerOfWorlds they almost destroyed all time and space]]. Rather than simply being cold-hearted, the Silence realized Kovarian was a liability more than anything and disposed of her. If you interpret the "use River as an assassin" as Plan A and "blow up the TARDIS" as Plan B, it's the Silence deciding they should just be in charge of the plan themselves...[[TimeCrash which]] [[RetGone went even worse]]. The reason why Kovarian and the Silence never went after an earlier incarnation/only show up in the 11th Doctor's time is because [[HeelRealization they realized]] [[NiceJobBreakingItHero all they were doing was making things worse]].