eph221
It's because they're union! Fly southwest!
I expect it is more of an issue with the fact that the airlines (pretty much all of them) have a contract of carriage that limits their liability for damage or loss on pretty much everything they put on the plane. If they were routinely paying for damage of expensive items, there would be an incentive to supervise baggage handlers union or not. You can declare excess valuation on luggage and pay what is basically an insurance fee, but that option is limited.
United says:
Except for certain International Carriage subject to the terms of the Montreal Convention, declaration of higher value shall not apply to sporting equipment, golfing equipment, bicycles, personal human transporters, musical instruments or musical instrument cases or strollers. United does say they will carry a properly packed large or fragile musical instrument as Cabin Baggage, if you reserve a seat next to you in advance and pay the applicable passenger fare for the seat.
Southwest says it is not available for a bunch of things including "fragile items" which presumably would apply to guitars or anything else that gets broken. They will allow a guitar or other large and fragile instrument to be carried on a seat: A reservation must be made for the instrument or equipment at a charge no greater than the Child Fare for each seat used.
There is little incentive for any carrier to provide special handling for items for which it can charge a passenger fare to properly protect.
As someone who has had a guitar destroyed by "normal baggage handling" and someone who has worked as a member of a union with fellows who nonetheless take their work seriously and show due care, I submit that your snide remark is unfounded and misses the point.