Don't you think all these Hollywood methods are made just to lead us to failure ?
As a writer, I think there are a couple things happening.
The first is that in the same way newspapers don't report the details of suicides, to discourage "copycats," Hollywood doesn't want to give accurate depictions of suicide that could lead to studios being sued. Sure, if a character dies by leaping off a cliff, there isn't much a director can do to blunt the accuracy of that depiction. But at the same time, if the method of suicide is more involved, he won't dwell on any details that might have people from here on ssf taking notes as they sit in the theater.
The other aspect is one any storyteller is aware of: the director doesn't want to dwell on the method, they want to portray the effect to evoke a response in the audience. It doesn't matter that a character cut her wrists, it matters that she was desperate and that she chose a private setting to succumb to that desperation. Over-simplifying the act of suicide allows the audience to feel what it meant to the character without the storyline being bogged down by technical details. They resort to tropes as a shorthand that keeps the story moving, and most of those tropes about suicide happen to be technically inaccurate.
BUT, the problem with using inaccurate tropes in the movies is that then people like us get inaccurate ideas about methods, or even about how difficult it really is to kill one's self. So I thought this thread might nip some of those misimpressions in the bud, so to speak.