Well the short answer is because I can read. But if you really want to break it down here's an easy one. Just look at the figures for disobeying junction control (i.e. ignoring red lights and similar) - twice as many down to motorists as cyclists.
Study did show greater % of men jumping lights, though nowhere near the disparity you might imagine. It also tried to ask the question as to whether their was a difference in red-light jumping depending on the direction taken past the light (left,ahead or right) - though the methodology for that...
Cyclist KSIs - mainly the motorists fault.
Every time you perpetuate the myth of all cycists being irresponsible you are encouraging an attitude that leads to deaths.
Studies show that in London (anecdotally the worst for offenders) over 90% of cyclists obey the traffic signal, and the non-compliant numbers include those who take a slight jump to get a safe amount of road space and those using the old motorists mantra of 'blushing amber'.
Further the levels...