In some cutscene or trailer, it said that he hated guardians, and that he would often send them to their deaths on pointless quests (IE: Gatelord head), or he’d just kill them himself. Why he holds the grudge against guardians? I’ve got no clue.
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He loathes guardians and have no problems killing them regardless if they’re ghost is alive or not. Only one person held the chain from committing mass murder and that was Mara and she’s conveniently absent.
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I think that's the very first lore text you get on Uldren, where it talks about how much he hates Guardians. So, did that just extend to Cayde, and he couldn't resist killing a ghostless Guardian? He seemed so deliberate about it, though. My other theory is that the darkness inside him made him do it. I think I'd be satisfied with Cayde being killed by the Darkness itself. That's kind of a cool way to go.
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I bet it is because we called him the emo prince...