I think it was to signify that everyone, no matter how pure of heart they may be, would be drawn to the Triforce (Link goes for it), and that they'd be willing to betray the ones they care about to get it (Ilia pulls a knife on Link, and he kills her). The Triforce's absolute power would corrupt any who desired it (Dark Link x3). I'm at a dead end over the multi-Ilia part, but I'm sure it's relevant.

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"Yeah. I ended up backstabbing Scoria's babe. Deployed an Ubercharge, if you will. Erected a dispenser. Finished her up with a headshot." - Jodd

May: The Month of Pandaemonium