I agree no one intended to hurt the kid. The problem is that, once he was hurt, they engaged in a series of stupid decisions that pretty much sealed his fate and, based on what has been presented to the public, seemed far more concerned with avoiding minor consequences than the health and well being of their friend. Maybe they thought he would be ok. Maybe they really did not know. But, from what I remember reading, it got to a point where it became more about keeping it quiet than helping.
I said criminal stupidity but that's really criminal negligence. They should be held accountable for it. I don't think it's manslaughter, based on what I know about it at least, but it's not nothing.
Like I said - a tragedy for all involved.
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