It's not a perception, it's experience. For example, when walking from Lower Marsh (near Waterloo) to Marble Arch, I counted 84 cyclists. 48 of them committed one or more of the offences I've listed.
When driving along Ruckholt Road in Leyton, there are five sets of traffic lights. I counted 24 cyclists go through one or more red lights, and none who stopped at them.There were three near misses with other vehicles.
Driving from Forest Gate to King's Cross in the dark, the split of cyclists with lights and without is pretty much 50:50.
Ruckholt Road is dangerous and designed with no consideration for cyclists.
Typical cycling conditions:
http://1.bp.blogspot.com/-Z-11ECU2hTI/TiMNZ5jY5LI/AAAAAAAAFZs/Irir-H6uzR0/s1600/ruckholt+rd.JPG
There is a cycle lane here which sandwiches cyclists between parked cars on the one side (serious risk of death if motorists open the door into their path) and articulated lorries on the other.
The purpose of this cycle lane is to permit motorists to pass cyclists closer than would otherwise be safe.
The road is lethal and a mess and you need to cycle with that in mind.
If you cycle as the road engineers would have you do, you place your life in other's hands. Not a good idea.
I can't comment on the generic 'going through red lights' without seeing specific examples, but I have cycled down that way a few times and the standard of driving and consideration is very poor, and breaches of the Highway Code by drivers are pretty much continuous.
I would imagine that cyclists just want to get out of the way of the crappy driving (let's not forget that the proportion of unlicensed, uninsured drivers in London is very high). Waiting at the red light is not necessarily safer than going through it.