Can someone explain......

Why, when there are cycle lanes on the footpath, do cyclists feel the need to use the road alongside cars? Why sit at junctions or roundabouts Infront of cars when you have lanes about 4ft to your left? What am I missing here? Perfect example this morning, cycle lanes all along the route, mr I'm a cyclist using the main road, holding up traffic at 10km/h, then sits at a set of lights, middle of the road, takes off uphill holding up about 30 cars behind.

Im not a cyclist, but common sense to me, would suggest, use the cycle lane, away from the big moving death machines.

No?