I was pointing out that this hospital in a war zone did not display any recognition signs if that earlier image was correct.
If no such signs were displayed then their case is weakened.
That's a good point.
Unfortunately there are a few problems with the idea of painted an appropriate symbol on the roof.
For one thing, paint doesn't show up particularly well on IR. For another, rebelling tribesmen in Afghanistan tend not to abide by the Geneva Conventions and it wouldn't be long before they spoofed the system by painting red crosses or crescents on all sorts of building all over the place if they felt it might give them some immunity from air attack.
Do any buildings anywhere in Afghanistan have such symbology to prevent or dissuade air attack?