As someone who has experienced something like this...
I begin questioning the ethics of the people around - the society. This was in the 1970s so obviously mental health was treated differently in those days. I was not born then but I have experienced psychiatric care after being depressed for most of my time in high school. Long story short - I was in a psychiatric facility for 8 days and 7 nights, had to go to court-appointed therapy, and to this day I am still not 100% better even though I am on Prozac.
Anyways after the first girl's suicide attempt she would have been committed to a hospital for a set number of days until the doctor deems her mentally stable perhaps Danny DeVito didn't know the warning signs or just didn't care.
Secondly, someone should have reported the parents (mainly the mother) to DCF. Locking the girls in the house could be considered a form of neglect.
Finally, probably the most haunting thing about this film was the last few scenes where the boys were reflecting on everything. Not only did their parents move on like nothing had happened, but people were even making fun of them (like the guy falling into the pool at the party).
Suicide is a controversial topic and there are many people with absurd opinions like it. I've heard people say that people who kill themselves are cowards and selfish and that is simply not the case. Often times people kill themselves because they think nobody will miss them, or that they are doing the world a favor by ending their life because they do not feel like the contribute anything to society.
Anyways, that's just my 2 cents.
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