Aeroplanes are often complicated beasts which are made up of many moving or stressed parts which have a tendancy to fail when least expected/wanted. As such failure or damage to said collection of items is expected with use, often aided by our feathered friends not getting out of the way. Operator error also accounts for many failures/much damage, but we all should be able to learn from our mistakes. What can't be excused is some dullard ramming a set of steps into the side of something the size of a 747, it's not as if you can't see the damn thing and the doors are quite clearly noticable.
What is the excuse offered for this latest in a long line of muppet cock ups? "It suddenly jumped back 15 feet and then lurched sideways!"
I think the description "movements" says quite enough about the trade if you ask me.
