Blindly or otherwise why break a law just so you can save a few seconds and place yourself in unnecessary risk? How many cyclists scream blue murder about a car who wants to overtake and can't. I'm sure the same argument has been made on many an occasion. I am also sure the driver believes he/she is doing nothing wrong.
I don't do it so I can't say why.
I've asked people and they say because they don't want to slow down, loose momentum etc..
From my observations, rljing in London is rarely done on a busy junction and mostly done at pedestrian crossings where no one is crossing. So there rearly is no to limited danger.
Again fom my observations the people that jump red lights are not the people that complain about drivers, as they just don't care about anyone or anything!
Personally I think people that brake basic road laws are being contradictory if they then complain about others. That is highlighted when a video camera cyclists posts footage online of them doing something dodgy, loads of us will pull them up on it.