Contributors bickering among themselves doesn't alter the fact that the savages who are collectively known as Islamic State would have, eventually, gained arms from somewhere (anywhere?) with which to wage their 'Holy War'.

There is no possibility of negotiating with radical Islam, as it's adherents do not interpret the words of either the Quran or the somewhat doubtful record of the habits of their 'prophet', they are told exactly what Allah requires of them. Their fear of the various terrifying punishments for disobedience, or their pitiful, deluded, expectations of sexual gratification (that, of course, being the absolute peak of possible human experience!) from their promised virgins soon persuades naive and fearful, testosterone laden, young kids to pledge their lives for the cause of Allah! To them, anyone not Muslim is as dirt under their feet, and therefore their views, beliefs or opinions are completely irrelevant as they are obviously not subjugated to the words of Allah's Quran as recited by Muhammad.   

The fact that 'converts' (however converted) repeat the words of the shahada is good enough; actual belief is not really worried about as long as the new recruits bow down to the sacred stone in Macca 5 times a day and fill their conversation with insh'Allahs and al ham dulillahs, they're fine!

If they aren't stopped soon; it'll be us that will be repeating those words before long! Better get some practice in, eh? All together now, repeat after me "I bear witness that there is no god except Allah...."