Because they seem to be the ones agitating for change. It's a new model - if you want something find a way to pay for it.Why should cyclists be singled out and expected to pay all the costs towards the a publicly provided infrastructure?
I haven't proposed extending the model outside the bounds of the topic under discussion. Maybe you ned to start a new thread.To extend the same ring-fencing logic you propose to motorists would see a large increase in the charges they face,