"If the problem is Islam itself and to quote 'they all need to die' does that mean the answer is the mass slaughter of muslims?" - of course not. I said all jihadis need to die not all Muslims need to die. Please don't misquote me again.
"My second question is why do ISIS kill muslims?" - ISIS views Shia as apostates and so kills them. Ditto Allawites.
ISIS also kills Sunni Muslims who transgress Sharia law, and kills Sunnis who reject ISIS. Just because ISIS kills other Muslims doesn't necessarily make it un-Islamic. Muslims have been slaughtering Muslims of different sects for over a millennia.
Agreed, Western foreign policy has been disastrous and is certainly a factor. But what about Abu Sayyaf? It is a terrorist group based in the Phillippines. It recently killed two hostages - John Ridsdel and Robert Hall. What Western foreign policy prompted this?
Military action will play an important part in this issue, as will promoting Western education to local people.