Dallas
Afraid the insurance Companies will only pick up so much of the cost and most airlines have a high excess which comes off the bottom line. It's the other costs as highlighted above which also hit the hard, a/c out of service, delay, disruption - these incidents are serious.
Careful selection and training of ground handling staff is essential and removal of 'hold harmless agreements' in handling contracts. Yes perhaps the handling fees may go up as a result, but it might well focus them on ensuring their staff exercise max caution when working around aircraft.