system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the anti-vaccination movement still a thing?
gpt
Because people are stupid is the simple and short answer. There are still people who believe the Earth is 6000 years old, or hell, even that it's flat. There are still people who believe homeopathic medicine works, even though most homeopathic pills actually contain not a single molecule of the original substance. There are still people who think lizards rule the world.

Lack of evidence has never really stopped dumb people from being dumb.