You don't quite get it. That's fine.
Knox has said nothing about the level of planning and orchastration behind the prank.
It may have been planned weeks before, or it may have been planned on the spur of the moment whilst the housemate(s) were out.
However, the guilters are taking Knox as admitting a level of planning not contained within her actual admission. Not just 'she organised it or she would have said otherwise' but a level of masterminding indicating a malicious and borderline sociopathic mentality.
Guilters aren't just talking about 'enjoying it' - nor did Knox for that matter - but a level and type of enjoyment at causing others peoples suffering that is totally unlike the typical prank motivator which is a bit of fun and a laugh.
Guilters are acting like it was her idea, her planning, that no one would have done it if she hadn't suggested it and cajoled, forced or manipulated others to go along with it, that she came up with the idea because she likes causing harm and distress to other people, , that the distress and harm was the intention of the prank and not an unintended effect (although in retrospect it should have been predictable), and that she has a habit of intentionally causing others harm and distress for no better reason that she just enjoys it.
That's a heck of a lot different to what is contained and implied by her admission.
Quite simply, when they take Knox's admission and run away with it, they destroy the last remnants of their credibility.
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