aluminum bends and creaks. yes, it will snap, sometimes without warning, but most of the time you do get some indication that something's wrong.
yes, carbon forks work quite well and are common on cross bikes but they arent clamped on in many places and scored like carbon bars.
i do admit that aluminum can fail dramatically, and i avoid carbon handlebars on my cross bike because there's damn good reason to (and because the performance improvement does not outweigh the cost).
aluminum and carbon fail differently.