Kabul
I've only been in a couple of times in the last year and it was quiet (as the grave?), but there again ANYWHERE is quiet if you're not being shot at.
When an incident occurs then all the armchair experts start theorising about the rights and wrongs of operating into conflict zones.
It's very simple, if you're not happy with going - don't. When I was in the military, I was paid to take risks - now I'm not. I shan't go again - for no reason other than it's a personal choice.
I agree with the comment that airside at Kabul is probably one of the safest places in Afghanistan - but only until it isn't.