because in a world where "everyone but us is the enemy" and the oppressor, the only person you can trust is yourself--and thus, if you're lucky enough to have an extension of yourself, an other half, that's someone else you can trust (in theory) and when those two combine the whole is greater and more powerful than the sum of its parts. or at least the illusion of that power is there. this is really basic i know but i think i just understood something important about this dynamic and now i am having even more thoughts yes good