"These threats exposed him and those around him to a degree of risk I considered unacceptable." Degree of risk? You mean getting shot or blown up? And the rest of the military doesn't face this?
I don't even think we, or our allies, should be there but this is just a stupid reason for pulling him out. He deserves the same treatment the rest of the military does. What's the old conservative argument? "He knew what he was getting into when he signed up."
It's not a stupid reason for pulling him out, it is common sense. Insurgents in Iraq named Harry as the #1 target of all US/UK personnel in the country and announced a huge all-out targeted campaign to kill him in a propaganda coup. Of course other members of the UK forces face a general risk but statistically it is, believe it or not, low and nothing like as great as this heightened specific risk. His degree of risk, and therefore the degree of risk of those around him, is the greatest of all - and completely unnecessary as he would only be going in a regular capacity, it's not as if he has a unique role to play, except for propaganda purposes on the British side.
Harry is the grandson of the head of state and colonel in chief of the second biggest force in Iraq. He's the son of the next head of state and the brother of the one after, and so on,as well as being Diana's son. He is much more famous throughout the world than George W Bush's children and the US would never send the child or grandchild of the President into foreign combat if they had been announced in this way as a specific target.