Virgin: I think there is a significant difference between the air hostess and the people on the plane in Kenya - put simply, she was hurt, they weren't. They had a lucky escape, and in their position I would like to think that I was simply grateful to be alive, rather than looking around for someone to sue.
You say that many of us get mugged and then have to return to work - sure, but how many of us get mugged AT work? When I come into my office in the morning, I expect to be safe. Ditto, I imagine, when you perform your pre-flight checks - you don't walk around the aircraft in fear of some nutter jumping out at you.
If you're mugged in the street and returning to where it happened distresses you, you can do something about it; avoid it, take another route. This air hostess, in order to do her job, has to put herself back in the same situation where the attack happened - that must be stressful. It must take a great deal of self-control for her to do her job without looking at each passenger and thinking "will s/he be the next one to attack me?"