Love is another name for gravity — the instinct that lost the vote was right out in space.
Amelia's line — 'love transcends time and space' — is dismissed as sentimental in the briefing room, but at the film's two decisive moments (Cooper finding the precise moment in Murph's timeline inside the tesseract, and the Edmunds planet actually being habitable) it is proven true after the fact. Just as gravity is the one force that leaks across dimensions, love operates as a filter that picks out information across spacetime.

