As a past ground staff for a regional airline and a commercial pilot I will tell you the reason why these incidents of aircraft being damaged on the ground occur. It is because the airline hire these twits directly off the streets with no aviation background whatsoever. As a pilot myself I took a great deal of care in preparing an aircraft for departure.. .Some of the things I saw on the tarmac would give you nightmares!. .people nearly walking straight into props, aircraft moving out from the bay with tail stand still hooked on, driving GPU away without disconnecting first, driving tugs into the side of aircraft! The worst sight I saw was a CRJ-200 try to taxi out but unable to turn as the ground staff forgot to do up the torque links!!!