The point, Linf, which as usual you spectacularly fail to grasp, is that proponents of the Thudguard use exactly the same arguments as proponents of cycle helmets.
However, most people rightly dismiss the Thudguard as a ridiculous over-reaction to a small risk (and I would guess that there is actually a bigger risk of head injury to children in the home than there is on a bicycle). How is it OK to dismiss the Thudguard, if you do not also dismiss the cycle helmet?
Now, how about you respond to my earlier point, that the risk of head injury as a pedestrian is broadly similar to that of a cyclist, so why is no-one suggesting helmets for pedestrians?