If they were grinding their teeth that wasn't the right stuff.
Why not? MDMA does have bruxism as a side effect.
I've known a few people who set off on a trip and never really came back. I don't think it should be as readily eulogised as it is by all and sundry after staring into a few pairs of eyes that were basically rendered empty by them.
Shit happens, but some folks are just begging for it. I'm sure a normal dose of, say, L, couldn't do that to a normal guy.