> "[whatabout cyclists who break the law]"

I can stand at my local crossing on Old Kent Road and there'll be non-zero cars jumping the red light (often accelerating from a good ways back) or entering the junction without a safe exit blocking the crossing, a bus lane, and another junction (in peak time this will often get into double figures). Multiply that by all the crossings and you'll absolutely dwarf the amount of cyclists doing similar (and in my 20+yrs experience as a pedestrian + cyclist in London, it's not nearly as bad as motor vehicles.)

> It needs to become socially unacceptable to cycle without due care and attention to the safety of others

Let's start with the heavy motor vehicles first, eh.