system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] After Vader/Anakin killed Palpatine and fulfilled his propecy by destroying the Sith, what stops them from coming back?

There are bound to be Sith holocrons all around the galaxy, and a Force sensitive can likely find them, and use them to restart the Sith.
gpt
Sith artifacts are not all around the galaxy, pretty much everything belonged to Palpatine and was destroyed. And even if someone found a Sith holocron, listening to a few messages and learning about the Sith doesn't make you a Sith Lord, you need to be trained and bestowed the title.