First, at the same time that the other cast members spoke on social media, Baio put out his own message:
"May people remember Erin for her contagious smile, warm heart, and animal loving soul. I always hoped she could find peace in her life. God has you now, Erin."
The people in this thread who are pretending he didn't say this should be ashamed.
It's very seldom that the deaths of drug abusers are officially attributed to drug abuse. The people at the scene will attribute the death to whatever stopped the person's heart. Wikipedia right now is saying throat cancer - that's heavily associated with both abuse of alcohol and with smoking of any kind. Drug abuse undermines a person's health, stops them from seeking medical attention, and cuts them of from people who would try to get them back to normal lives.
It is normal to be angry at someone who you were close to, even after they die. There's frustration, there's guilt over not doing more, there's resentment if the person chose a destructive path and wouldn't leave it. In such circumstances, it's possible that the person who died would not have wanted their death to be romanticized - they might actually have wanted to tell people in plain language, "Don't follow me down this path," but couldn't get straight enough to do it.
People have to be given the opportunity to grieve in their own ways, and they especially have to be given that opportunity by people who don't know either of the people involved.