Kids will be kids they'll join anything to rebel at the establishment. When I that age it was all anti poll tax and anti fox hunting. They don't think through and can't really envisage consequences or the scale of consequences and by and large a great number are very very impressionable and get wrapped up and easily follow friends, love or causes. Add into that mix some people (who recruit them for ISIS or encourage them to go) who can be very persuasive and manipulative then it is hardly shocking they go off on what they consider a good idea at the time without thinking any of it through. Add into that a undercurrent of sympathy in Muslim people for the suffering of certain populations even if they don't tacitly support the actions of ISIS and you have a potential brake to the process removed.


