surely that is a good enough reason ?
would you do it if you were driving a motor vehicle of any description
On one of the lights there should be a filter arrow to turn left but there is not , dont ask me why because I dont know, so I turn left as the cars from the left come out to their right, like I say no reason to stop other than the light is at red( I do stop for green man tho) and last week the police were in the queue of traffic so slowed right down in cycle lane til lights changed and as I got to the corner at the traffic light to turn, the car to my right cut the corner but luckily I thought he might athough he wasnt indicating to turn left and I managed to stop, so next time police or no police am going through , Dont know why they stop cycle lanes before a corner instead of around the corner, surefire way of getting someone killed!
The second light I jump is one where the lights at either side of a small narrow rail bridge where both lights are always at red to allow walkers a safe course across the bridge and if I didnt want to jump a red light would have to either walk in my cleats or wait for a car to come so I just go throught it when clear to do so.
In answer to your second question I would jump the second light in a car if it didnt respond to my presence like it dosnt on the bike but I imagine it would so I wouldnt need to.
I think people see these idiots in big citys jumping every light n going through pedestrian crossing and assume all red light jumping is bad when its not, there are a lot of red lights where the law should be changed to treat in particuliar left turns like you would treat a stop sign so you can turn left when safe to do so while cycling,this would allow the cyclist to get ahead of traffic and IMO a lot safer than waiting and getting cut-off on the corner especially if a large vehicle appears behind you as you wait.