The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Why would caffeine increase aggressive impulsivity? Well, the general effects of caffeine are to increase autonomic arousal. The activity of the so-called sympathetic arm of the autonomic nervous system, which is to put it very much in plain language it's the alertness arm of your nervous system.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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So put simply, caffeine can increase impulsivity, no surprise there.