Cults are a fascinating aspect of culture and society - if you are obsessed with understanding why and how this could possibly happen, here's a list of wild cult mentality documentaries.
One of many good documentaries about scientology
Going Clear: Scientology & the Prison of Belief
Truly a tragedy but completely fascinating
Waco: The Rules of Engagement (1997)
Could not stop watching, kept me engaged the whole time
Escaping Twin Flames
You thought you knew the Duggar family? Think again
Shiny Happy People: Duggar Family Secrets
There's a fine line between communes and cults
The Source Family (2012)
Creepy and made me think for weeks
Holy Hell
An oldie but a goodie about a well known serial killer
Manson (1973)
Did not think this one would be as good as it was but it's actually one of my favorites
LuLaRich
How free love turned into mass murder
Watch Wild Wild Country
Some cults don't seem like cults until it's too late
Watch Dancing for the Devil: The 7M TikTok Cult
The cult that's secretly running the US government