User blog comment:PerhapsTheOtherOne/Speculative Spitballing: Goliath/@comment-25555436-20150608190144/@comment-7622429-20150608205659

Perhaps not doing damage at all is too broad, even though that's exactly how sources describe them. Yes, damage is done, but it's SO INSIGNIFICANT, it'd take several years worth of continuos fire to actually kill these things.