system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] During the sorting hat scene, Ron says "there's not a witch or wizard who went bad that wasn't in Slytherin." Why then, were the students who were sorted into Slytherin not put under any sort of special watch to prevent more Voldemorts?

Title.

Not that every witch or wizard who is in Slytherin turns bad, but all the worst villains were at some point in Slytherin. So, why does Hogwarts allow them to train in powerful spells? Why aren't they pulled aside and treated as the potential dangers that they are?
gpt
Because Ron is an 11 year old boy who doesn't know what he was talking about.  Does Slytherine have a higher share?  Yes, but their defining trait is ambition.  There are plenty of good wizards from Slyherin and bad wizards from the other houses.