I have seen the results of several ground handling accidents/incidents resulting in aircraft damage, most could have been avoided by improved awareness and training. The majority of handling staff I have encountered are hard working and helpful but as always there is a minority who treat the ramp as a race track/skid pan and who have no conception whatsoever of the potentially serious consequences of causing even (perceived) minor damage.
Ramp safety and awareness is pretty much taken for granted in some circles and in the current economic climate an insurance claim may be acceptable to the beancounters when compared to the blanket training/paying of handling staff to a higher level. So as long as ground equipment and vehicles need to be operated around aircraft on the ramp, these accidents will continue to happen.