“Unless the parents are drunks or drug addicts, it’s senseless to place blame on them.”
They weren’t monitoring what the kid was doing online. It isn’t senseless to place most of the blame on them.
Ultimately, she made a stupid and fatal error in judgment. No one held a gun to her head. Presumably she could read and was smart enough to know it was a risk. Something that can go wrong in one take is not anything like parents noticing a change in behavior, health issues and the wrong friends but doing nothing about it. Individual responsibility starts much earlier than reaching the age of majority.
I would certainly want parents to be aware of the dangers of social media so that they would check it out, but it would be even better if they taught their offspring to not take chances with any form of intoxicant.