Traffic lights, a cyclist jumping a red light is unlikely to kill someone, a driver cutting a cyclist will. Now I agree if a cyclist is endangering others by doing so is bad and should be punished. If however, they are jumping a light to get ahead of the traffic so they don't get caught up in it when the lights turn green, this surely is safer for everyone? Furthermore, show me a driver who doesn't break speed limits, even by 1 or 2 mph... It's still breaking the law, now, I think we can agree that's probably not unsafe, so lets not get our knickers in a twist about minor traffic violations.
Riding side by side is actually safer for everyone than if they were in a line. A cyclist is entitled to the entire carriageway so a car should only pass if the other lane is clear to do so (as they would if it was a small car), so riding side by side actually makes the overtake shorter and therefore safer. It is also safer for the cyclists as the driver is forced to make a safe pass. This is particularly the case on narrow roads where drivers may try to squeeze through.
Riding is the dark without lights is frucking stupid I totally agree, equally cyclists without helmets on or any form of high vis apparel.
Changing lane without signalling I agree can be annoying but if you're behind the cyclist you should be a safe distance away to notice the lane change, furthermore, many car drivers do this.
I understand where you're coming from, some cyclists are dicks, equally some motorists are dicks, and there are a lot more motorists than cyclists on the road, ergo, more dickhead motorists that cyclists on the road. (I appreciate this maths is flawed but you get my point)