One thing we can always rely on is that the media and even society will always find a scapegoat in these tragedies because that's easier than having a discussion on suicide prevention.
Whether it be a stupid prank, (ill-advised, immature, humourless, it doesn't matter, it was a stupid prank) or on-line bullying, or whatever. They may be a trigger for a suicide, but they are not the cause and we shouldn't draw a direct link between the two because it exaggerates one act and belittles and diminishes mental health issues.
Sadly, until we can just discuss mental health without any stigma, without any need to label, blame individuals or blame acts, we'll continue to have people needlessly left with the idea that they only have one option available to them to end the turmoil.
Of course, two idiot DJs in Austrailia are responsibile for all that.