Under the convention, the wounded and sick should be collected and cared for by an impartial humanitarian body, such as the Red Cross.

Anybody who thinks that is wrong, in my mind, is no better than the likes of the Nazis or Japanese who treated jews and our soldiers so badly during the second world war and must have a complete lack of compassion for fellow human beings.
The Taliban do not recognize the Geneva convention so considering the Atrocities they commit even to young children, then it's gloves off and lets get rid of em all.
Joe does not like what ifs but I'm going to say it again.
We let the wounded Terrorist off,he recovers and masterminds a plot to blow up a plane/Planes carrying civilians in,how would you feel then?
Ok far fetched but just to prove a point.
It's not a Normal war with normal rules and joe and Lordna you keep quoting laws/rules etc,sometimes rules have to be looked at and individual cases dealt with compassionately.