This.
There is a lot of great people in courier companies. Most of them can’t deal with the pressure properly. With the amount of parcels today every major courier company knows that there will always be work. And on paper everything looks nice and clean with all the rules and requirements, the reality is very different. There is only so much a human can do before he’s forced to cut corners. And that’s when the damage happens. The worst thing for me is that the people who are responsible for putting such a ridiculous targets on courier have never done a delivery in their lives. Most of it is all estimate. And they always try to squeeze more and more out of the hard workers. Not much we can do about it...
Edit: On the other hand we can’t forget about the amount of parcels being delivered in total. The damaged ones are probably a very small percentage. Mistakes happen. And we, the bass players, sometimes driven by GAS are using couriers to post naturally fragile things. Sooner or later, an accident happens. I doubt very much that a courier would damage anything on purpose, 99% of the time it’s just an unfortunate event.