I cycle to work through central London about 3 times a week and do get frustrated at fellow cyclists doing things that are illegal but also foolish. I completely understand why some cyclists run red lights (because it takes a lot of energy and time to stop/start) but I dread the day when I see someone get wiped out. I don’t do this in the hopes that it will educate those who just start cycling.
I like the idea of music on my commute but could never because I don’t want to see the underside of a truck or an inappropriately large car.