They believe in medicine but not certain mental illnesses. There's talk that the boy had autism which isn't recognised by Scientology, they've always claimed it was Kawasaki disease. The seizures he'd been having were apparently treated with medication at some point but didn't work so they stopped it.
No matter what it's very sad.
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"Do not wait for ideal circumstances, nor the best opportunities - they will never come.
- Janet Erskine Stuart