People use these killing machines of course without any intention to kill. The problem is the unexpected circumstances that can cause loss of control of the machines. Since humans are in control, human failures play the most important role. Any vehicle can become an obstacle to the other, if it crosses its desired or accidental trajectory. Trucks become passive killers when lighter vehicles collide with their sides or rear ends.
Trucks kill even when they are parked alongside road shoulders.
Trucks kill passengers of light vehicles due to differences in height and in the resistance of their upper parts at the rear end or on the sides. This means that trucks do not absorb energy by deformation. It is possible and very important to minimize the consequences of these collisions.