Very dumbed down kabbalah that is glossing over a ton:
There was one universal soul that broke into billions of soul shards which then split into other soul shards etc. Everyone is born with a soul shard and a mission in life that if fulfilled, helps the soul shard be reconnected to the universal soul. People with Downs/people born disabled by nature have far less capability to fulfill their life mission and so it's assumed that they are reincarnations of holy people who need to do one more small thing before rejoining the universal soul.
If you're a bad person, you go to gehenna to have your soul scoured and then go back into the cycle of reincarnation to atone.
I watched the first 5 minutes of the documentary and had to stop because I'm laughing so hard that I'm afraid it's going to wake the baby.
https://youtube.com/watch?v=Nd17ZGaoZ58
Tyler keeps pronouncing Kiryas Joel as Curious Joel. He complains that this town is a homogenous town dedicated to one ethnic group as you see this image:
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Then observes that Mexicans are doing work in the town.
He does an interview with a naive hasid and after a short time talking, the hasid leaves then calls him back to tell him this
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I'm going to have fun watching this.