I'm not sure. How can you prove that Saudi's chopping off folks heads is morally different to the IRA, or the British Army, or the police shooting that bloke that killed all those folks on Westminster Bridge.

They all reckon they've got fantastic reasons. They all claim the moral high ground. its just value judgements and if you're the poor sod getting the chop, i suspect the motive for chopping your head off is of little importance.