...and that there was next to no interest to stop the spread of such elements like the ISIS so far, and that for reasons of 'political correctness' is rather 'obvious' (after all, we can't go demanding Saudis to clean up the mess they've created through private sponsoring of such groups since 60 years, can't we, they're our friends, or aren't they...?), can be read here (ignore the title, it's rather sensationalistic, as usually in the media):

Iraq crisis: How Saudi Arabia helped Isis take over the north of the country
...Western governments traditionally play down the connection between Saudi Arabia and its Wahhabist faith, on the one hand, and jihadism, whether of the variety espoused by Osama bin Laden and al-Qa'ida or by Abu Bakr al-Baghdadi's Isis. There is nothing conspiratorial or secret about these links: 15 out of 19 of the 9/11 hijackers were Saudis, as was Bin Laden and most of the private donors who funded the operation.
...