I wear my coal scuttle when I have to, which is most of the time thanks to big brother. If I were still riding offroad, I would wear it there because the conditions are such that the benefits outweigh the liabilities.
As for a helmet law for cagers, that would make a lot more sense that the same for motorcycles. There are far more head injuries sustained in cars than on bikes and the problems that helmet use can cause are far fewer. In fact, I would go so far as to say that the tremendous benefit of helmet use in cars where their use is not required belies the notion that motorcycle helmet laws are purely for "our own good".

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python