MHO is that the bigger the vehicle you choose to drive the more responsibility you choose to take on. If you don't want the responsibility get out of your car/HGV, etc.. If a cyclist and a pedestrian are involved in an accident, my belief is in inherent responsibility, that pedestrian may have made all the moves to create the accident, but I chose to ride a bike. Whereas, if a cyclist and an HGV are involved in an accident, no matter who caused the two to actually collide, the HGV driver already has chosen to take on much of the responsibility by choosing to drive that vehicle.
+1