Warning: This article does not go over events that occur in seasons 4 or 5, but it does touch on material found in previous seasons.
The author of The Handmaid's Tale, Margaret Atwood, has the extraordinary ability to bring life to the abstract. She forces the audience to confront things that normally couldn't be put into words. We bask in the smell of genesis in Janine's birthing chamber. We learn what it feels like to be stuck in solitary confinement. We see the struggles of a high-ranking daughter growing up in Gilead, and we come face to face with true evil.
That's one thing Atwood understands better than anything else: evil. She sticks it under a microscope, tells us to stare into the lens. Then she holds our heads down, forcing us to confront it until we simply cannot bear to keep watching. It's because she understands something most of us have yet to comprehend. Gilead is our fault.
Our fault.
The system was thought up by men and women who betray themselves and those around them. There's the complacency, the progressives who should've been standing in the marching line with Moira and Holly and the rest of the collective, and then there's those who betray their own kind. They devote everything that they are to fundamentalism and the patriarchal power structure.
These are the women who are so self-deluded, so vicious that they can beat their slaves while calling themselves the righteous elect--God's chosen, held above the rest of humanity.
Serena has always represented those women and their puzzling motivations. She's the embodiment of the mindset that causes us to justify burning a peaceful world to the ground. To many, she is an enigma. We can't fathom what could possibly turn a woman like her into the monster she's become. She's too despicable, too twisted. It doesn't seem realistic.
But The Handmaid's Tale does an amazing job of showing us where she comes from and what she is. The show has everything we need to understand this beast and the forces she embodies, and it all makes perfect sense. We just have to grab a magnifying glass and go over the material.