Neither the Geneva conventions, or any other part of the law of land warfare, preclude us, or any other state, from effectively handling "terrorists". They are simply "unlawful combatants", and measures dealing with them are clearly outlined.
However, we have chosen to IGNORE those laws, and have granted terrorists MORE rights than they are actually afforded.
Why?
Because "we" have been lead by pussies for decades now.
"terrorists" are, like pirates brigands, slavers and cannibals come under the heading Hostis Humani Generis (enemy of all humankind) and have NEVER been accorded any rights beyond a sufficiently stout rope from which to swing.
hamas, hezzhollah, fatah, "al aqsa martyrs brigade", al quaeda, abu sayyaf, isis/isil, the moslem brotherhood, kony and his "lord's resistance army", the cartels in mexico, and any other group that places itself outside the bounds of law and tradition, practicing murder and mayhem for their own amusement and profit deserve no rights, just a quick and violent end.
all the breast beating and garment rendig from the left and their Pussy Posse of limp wristed whiney legalistic social justice warriors amounts to little more than self aggrandizement.
by calling everybody with a brain in their heads "heartless" they can feel their Feels and display their moral superiority.
just look at Bucklefuckle, who discovered nobody was listening to his plaintive wails, so he threw a tantrum and dredged up every thread Pinworm ever started.
all discourse must stop, until Bucky's tantrum is over!
Bucklefuckle is a prime example of the Social Justice Warrior, who lives only to prove he exists through shouting, screaming, shitting all over everyone and everything that doesnt conform to his imagined ideal, especially the restrooms in Wendy's.
if everyone put him on ignore, he would probably wind up in a psych ward under 24 hour a day supervision.