To be honest if you honestly think wahhabi Saudi has nothing to do with wahhabi Isis because you feel a responsibility to defend uks alliance with them - you're head is in said sand
Let me put it a different way.
ISIS - inflicting suffering and grief on muslims (regardless of sect).
Turkey - want Assad dead, want kurds dead, want possibly to extend into Syria's borders.
Qatar - standing by and watching.
Oman - standing by and watching.
Saudi - standing by and watching.
Now the above may not be strictly true. However in a publicly physical aspect their involvement has been zero. Behind the scenes I would suspect they would be helping both sides as desired with intelligence. Question - how much is driven by the desire to cause additional friction on the Israeli border?
Fundamentally - it is easier to demonise the "crusading pagan armies" of the west, but behind the scenes help them. It's also cheaper for those states - they don't need to put hardware on the problem, or do they then have to cope with a large number of crazy retaliations of extremists. They can simply maintain the status quo by rounding up the smaller number of extremists and executing them.
Once ISIS's back is broken, the peace and the prosperity of the region is down to the religious leaders - putting a tin pot dictator in there usually has two issues: human rights abuse to maintain position with the minority support, and secondly the individual's absolute power corrupts absolutely.
ISIS are simply attempting to create a state by dispelling opposition - therefore attempting to move from the minority to the majority over time. The reality is (a) their self appointed calaeph becomes absolute power -> corrupts absolutely.. (b) the mid period sees the minority in power committing continued human rights abuses (rape, murder etc) in order to drive out the opposition to become the 'majority' and safeguard their control.
I, as an atheist, don't believe it is right to sit back an not help people being subjected to that abuse nor do I think it's the right strategy to support regimes that rule in that way - regardless if they're non-religious, christian, muslim or other.
To the point about being "advanced" in democracy. An organised religion has no democracy - you cannot simply vote each session. The only "voters" are religious leaders of sects. You change your religious leader. In the case where the organised religion has state control - this can have dire consequences where the respective leaders are not compromising. The entire family is outcasts, usually driven out of the area or country - such is the oppression to conform.
This is the reason I see organised religion an abuse. If individuals wish to believe, and form their own interpretations of their religion - great, I think that's good. Where the line is crossed is where people are dictated to, oppressed to follow a specific dogma or interpretation as "the true interpretation", the fanatics demand people to demonstrate their "belief" by following the dictations publicly, by casting out people that are friends to show the strength of their belief.
If there is an "evil" in the world it is the organised religion, the word of man packaged up as the word of a "all knowing all powerful all understanding" being. If there is one good in the world it is the free thought to be able to have or to have no religion that you personally believe. To be able to question without fear, to be able to know the "power" of your belief is equal to any other one person without being pressured by groups or fanatics - that is a democracy in a religious context.
I suppose we, here the UK, are lucky to see that for what it is - just look at the CofE and how it's created. Then look at the Vatican and look at Islam and other religions - and then finally look at non-belief. Being able to take the different perspectives I think is something that makes the UK unique.
It's interesting that a large number of islamic rich families send their kids abroad to western schools and universities - the child picks up these perspectives, as well as understanding the perspective at home, however it appears that the parents value the freedom of thinking and understand how that this can contribute to their success.