Even forgetting "morality" for a minute, "to many people talk about that word in war time nowadays", you have to ask yourself would such a reckless use of power be helpful in accomplishing your mission?
There is historical material to support each view. Here's my favorite example of how the Arabs deal with Islamic fundamentalism that threatens the status quote
http://www.2la.org/lebanon/ee/terrorsy.htm . Funny but I dont remember citizens of the Worlds Democracies pondering morality when the Syrians slaughtered the city of Hama.
Apparently you've learnt nothing from the USA's failed "search and destroy" policy it used it Vietnam if you still think this is the best method to use during COIN operations.
Funny how these Vietnam folk stories persist. We won every major battle in Vietnam and the highly sucessful Linebacker air campaigns brought the communists to the negotiating table, and afterwards they violated everything they agreed to. The military accomplished "their" mission, it was the great "moralists" stateside, and the Politicians, that failed them.
There are actually some historical connections. For instance the ease at which the enemy rests, recruits, and rearms,in the Pakistan tribal Lands could be compared to Cambodia and how we allowed the enemy to regroup once they crossed that border.
http://www.pbs.org/wgbh/pages/frontline/taliban/ Iran is heavily involved in supporting the insurgency in Iraq and we handcuff our military in dealing with them as we did in Vietnam. Hell, in Vietnam we had some manure kicking President picking the air targets for the first few years, didn't allow USAF to bomb North Vietnam, and whom also forbade the USN from blockading or mining the enemies harbors. Well, at least LBJ considered himself "moral".:unknown
So history has shown us if we do to much, "moralizing", "limiting", "Politicaling", "micro-managing"...ect we are in for a bad time. The enemy doesn't burden themselves with such things. And we are placing our soldiers in an environment where they cant win.