but the bias is against the bike, not the rider.
sure, go after the squids that ride like idiots, but leave the bikes alone.
It seems to me that the author is saying pretty much the same thing you are:
It would be possible to limit the horsepower of motorcycles, but not politically feasible. After all, operators can take their bikes to off-road tracks and legally test their top speeds. So, the focus should be on stopping extreme speeding on public roads.