When I was writing my Taylor Swift Slytherin playlist, I said this about “Getaway Car”:
It’s not that Slytherins are in any way incapable of loyalty, but they are loyal to themselves first, along with perhaps one or two others. The driver of a getaway car, the rebound boyfriend, or the partner-in-crime doesn’t factor into that.
I’ve always thought that one of Voldemort’s biggest mistakes – second only to underestimating love – was making himself an army of nothing but Slytherins – Slytherins who all had their own reasons for joining him, almost none of which were about loyalty to Voldemort.
Dumbledore describes Tom Riddle’s school friends – and by extension, the Death Eaters – as “the weak seeking protection, the ambitious seeking some shared glory, and the thuggish gravitating toward a leader who could show them more refined forms of cruelty”. That seems pretty accurate from what we see. The Malfoys and Barty Crouch Jr. are of the ambitious type, Wormtail and Snape are definitely the “weak seeking protection”, and Bellatrix Lestrange and Fenrir Greyback are in it out of bloodlust. While they all gravitate toward Voldemort as a leader and are on board with his poisonous rhetoric, in a way, he’s just that getaway car driver.
No, that’s not quite right. For Bellatrix, he’s everything. Maybe for Barty Crouch Jr., too. Their primary loyalty is to Voldemort even more than to themselves. But they’re unusual exceptions among Voldemort’s followers. The Malfoys are loyal to their family first. Wormtail is loyal only to himself. Snape is loyal to the memory of Lily Potter before either Dumbledore or Voldemort. This is a group of people who, when they finally managed to capture Harry and his friends, spent so long arguing over who would summon Voldemort that they ended up escaping. There is basically no unity among them, and a common cause in name only; they’re in it for themselves. Their ambitions clash and their ruthless natures mean a lot of betrayals. In other words, they are all Slytherins and all want to be on top.
In contrast, the Order of the Phoenix is made up of people from all four houses, and Dumbledore’s Army is made up of three. From Hufflepuffs with their work ethics and unfailing loyalty, to Ravenclaws with their wisdom and creative thinking, to Slytherins who spy and work in secret, to Gryffindors burning with passion for a righteous cause, they are far from homogenous, and their members’ strengths complement each other. As the Sorting Hat warns at the beginning of the fifth book, the Houses are stronger together and, divided, don’t stand a chance.