As a London cyclist this how you HAVE to cycle. I heard this 'phrase' a long time ago and have ridden that way ever since.
It is weird how some cyclist somehow assume that a bike vs car wont always end up being car 1 bike 0.
It was 2-1 to the skoda fabia that pulled out on me from the left of a mini roundabout - My left buttock took a big bang and dented his bonnet (1-1) but my bike got mangled. But totally agree that you have to view every vehicle on the road is out to kill you.