If you read what I'm saying, I'm not saying they're incapable of paying attention, just that being a biker makes you more aware. I guarantee no matter how good a driver someone is, putting them on a bike will make them more aware. They have to be or they'll end up dead. Riding around on something with no protection and being harder to see will make you pay more attention to everything. Yes there are lots of observant car/lorry/bus drivers out there, but if they miss something the likely hood is they're going to survive; that chance on a bike is FAR less.