User blog comment:Patstriker25/Things I find disturbing about Mass Effect 3/@comment-24174486-20130730132904

1. Earth is in the heart of Reaper-controlled space due to the human race being chosen as the new capital-Reaper. Bringing the Citadel to Earth not only puts the final piece of using the Crucible against them behind as much of their defenses as possible but also serves as a place to bring human bodies, with the implication that they're creating a new human-Reaper aboard the Citadel.

2. See #1.

3. The Reapers guarding the beam to the Citadel only showed up once they noticed Hammer team making their way to the beam. When Hammer team showed up, the Reapers annihilated the entirety of Hammer team—or so was believed, as Shepard and Anderson (and potentially Shepard's squadmates) did survive, albeit injured, and managed to make it to the Citadel.