Bicyclists are vehicles are fully within their rights to take the lane. Furthermore, they use an negligible portion of the transport capacity of the road, that is a road segment filled with slow bicycles caries much more people per hour than a road filled with cars at optimum throughput. Since bicyclists are taxpayers, it's bigoted to say they clog the road: they use less than they pay for, while automobiles use more.

As for this maniac here, it's just a testament of how safe bikes are. It's possible to kill someone with a bike, but it's very very hard. It takes a frontal high speed crash to mortally wound a 70-year-old. The same maniac driving a car would have squashed 10 people on the spot. It's like comparing assault rifles with beer bottles and concluding they can both kill.