LSD saved my life. I suffered chronic depression and anxiety with suicidal ideation, had tried multiple psychiatric drugs and forms of therapy, and nothing had improved (the failure of these officially-approved modes of treatment actually left me feeling much more hopeless). Taking LSD gave me the insight that this wasn't fundamental the the nature of being me, that there was hope that one day I could love my life. The road to get there has been difficult, and has involved intense (non-LSD) psychedelic-assisted therapy to deal with very deep childhood trauma, but that first fundamental glimmer that there's a reason to have hope came from an experience with LSD.
If I had listened to stern authority figures telling me that there's never a good reason to try it and it could only do me harm, I would in all likelihood be dead today.