I honestly don't understand the thought process here, what the hell possesses somebody to think "Gee ISIS sure sounds swell! Lets go to Iraq and become ISIS groupies!"? I don't understand how any female would choose of their own volition to follow the teachings of Islam let alone join such a radical group unless they were indoctrinated by religious dogma from a young age.
Not sure whether to despise these girls for their foolishness or pity them because of their religious upbringing.
The morality of a higher purpose. Same reason why a lot of people, whether on the left or right, romanticize authoritarian governments that conduct atrocities for the higher purpose, whether it be 'social progress' (the Soviet Union and the left) or 'traditional moral values' and so on. It's not unique to religion, or Islam.
A good part of the extremist recruiting pool in the West comes from the disillusionment and disappointment of people who don't feel they can live good lives in Western society. This isn't 'good life' in the sense of standards of living, legal/political/social equality, career/housing opportunities, or income inequality- this is 'good life' in the sense of 'morally good with a higher purpose or meaning.' The people who focus on all those threads of worldly western civilization, SJW or counter-movement conservatives or the media or Occupy or the 1%- none of these are the solution, they are the problem. None of them actually do anything about real issues that these people care about- like Israel-Palestine or Assad's massacre of good muslims or the corruption and fake piety of the ruling Muslim monarchs. To paraphrase the Arishok, they feed and they feed and merely complain when someone inconveniences their self-serving and rotting status quo.
Some people pick a side. Some people get fed up and disengage. And some look for something, anything, that promises to rise above it all and Really Mean Something. The highest of all causes (God), the greatest of reward (the afterlife), the moral-self-fulfillment of setting yourself apart from the trash and doing something for the Right Cause,
It helps that ISIS can claim to be the sort that Gets Thing Done. They fought the Americans when people hated the invasion of Iraq, but most of the West was either complicit or tutted about without doing anything to stop it. They fought Assad when he was butchering good Sunnis. They put an end to squabbling divisions and in-fighting amongst rebels that fought eachother as much as Assad. They purged the old corrupt local elites and cut off the hands of lowly theives alike. They enacted simple, clear laws with simple, clear punishments that don't need lawyers or fine print to understand. And they did it for a simple reason: This is how Righteousness began, and this is what it needs to be again. The reward is the favor of God and the afterlife- something no idle consumerism or worldly liberalism or military superpower could ever match or take away from you.
It's more complicated than that, of course. It always is. But it's easy to romanticize ISIS from a certain perspective, just as it's easy to romanticize any atrocious and atrocity-born authoritarian regime that speaks to your sense of moral purpose.
As a certain conqueror once said-
“A man does not have himself killed for a half-pence a day or for a petty distinction. You must speak to the soul in order to electrify him” – Napoleon Bonaparte.
ISIS and Old Time Religion can do that as much as any secular ideology.