I don't see how Afghanistan is more dangerous than it was two days, two weeks or two months ago, surely the pilots involved know that as well and they would be naieve in the extreme to think that they weren't at risk on a day to day basis.
Unfortunately, the murder of their colleagues doesn't mean that the place is a greater risk, but just that the people who carry out these senseless acts have found someone new to pick on, which is why I wonder if the battle will ever be won.