Being im almost exclusively a scout rifle user in PVE, I'll quickly explain: The maps that Bungie shoves down our throats in Crucible are all CQC where pulse rifles and hand cannons are much better. Auto rifles would be king too but they're nerfed into oblivion at the moment. Sure, I would love to use one of my scouts in crucible, but I'd get my poop port fisted by a Thorn/Red Death user.