Why should we need AGI for AI to be more of a threat than a random human? We already have assassination bots that allow people to be killed from across the glob

Why should we need AGI for AI to be more of a threat than a random human? We already have assassination bots that allow people to be killed from across the globe. Add in your average sociopathic corporation and a government that has a track record of waging wars to protect its economic interests, and AGI becomes no more than a drop in that same bucket.