Wow... that's a lot of, um.... OK. I'd venture the ratio of clueless to beligerent is like 100:1, and the beligerent ones don't need headlight waggers, loud horns, or bright colors to want to wax a biker. Conversely, I'd also say that a vast majority of the clueless ones will remain utterly clueless unless you really hit them with something non-visual, because they're ACTIVELY not paying a bit of attention... they don't not see you, they don't see ANYTHING. Either way, I think I'll increase my odds of being noticed, because it only takes one to end ya.
I had an old fart make a left off a side street right in front of me once. I locked up the rear wheel, almost highsided, and spent the next 1/4 mile to the next light being road-ragey, weaving behind him, laying on the horn, and flicking my brights. Dude never noticed a single thing. He sat there, looking straight ahead, completely oblivious to having almost killed someone.
I'm not driving around with my brights on all day, though. I know it annoys me plenty to be blinded by the folks (in cars) who do, apparently clueless to the fact that even though they can't see any better, their brights really are aimed at everyone else's eyes. I might notice you, but it ain't going to be in any positive way. I'm not going to go commiting vehicular homicide over it, but it doesn't make me want to do you any favors, either.