They went to Syria to combat Assad and were recruited by islamist networks - but were themselves not necessarily as radical as their leaders - at the time when all different rebel groiups were combating the Syrian Army and making advancements.
They are now in Syria trapped in a very bloody fight without any mercy between Al Qaida - to which some of the groups adhere to - and the 'formal' rebel groups who have decided that the plan from Al Qaida to constitute an informal 'Islamic zone' from the north of Syria to the North of Iraq had to be defeated - beginning in Syria if they wanted to have any support from any other nation and didn't want to keep on fighting for years to come - while millions of refugees live around Syria in miserable conditions waiting to return.
Meanwhile the border with Turkey is now back under control of the formal rebelgroups and is now closed to new foreign fighters who are lingering around untill they can be smuggled across the border or are expelled by the authorities (even if some observers ask themselves how they could have gotten so far into Turkey without being turned back).
This means in fact that hundreds of Young Europeans are now trapped into Syria and it is not sure that each of them want to stay there and wants to keep on figthing - if they were ever send into battle and nobody is even thinking about how to get them out of there - if they would like to get out.
We are more worrying - against all the statsitical and other evidence - that all of them would become terrorists in our country - even if some can be and will for ever be dangerous. But meanwhile hundreds of people are being killed each week in the battle between the formal and the AlQaida groups - of which probably also young Europeans.
If we stand by and look it is as if they we are saying that 'they deserve it' even if it is not clear if all of them had any intention of becoming embroiled in an murderous war between AlQaida and the Formal rebel army.
They should at least have the possibility to surrender to the Red Cross during a truce in that internal fight and go home - whatever the governments will do to receive them and monitor them (which for Belgium could be a problem as our proportion of Foreign Fighters in Syria is one of the highest for Europe and our securityservices are not used to monitor up to 200 possibly trained AlQaida figthers of which some may be so indoctrinated). Besides we have also seen after the Yougoslav and Tchetchen wars that warriors among the refugees used their combat skills for criminal activity and that warweapons were being used - which poses new security questions to our police forces.
In an BBC interview some Syrian official says that many western intelligence services had contacted the Assad regime lately because they became worried - as they were during the Yougoslav civil war - that the war (just as any war in fact) would become a breeding ground for a new Alqaida generation of fighters who would return afterwards to their homes trained and radicalised.
For some this will be a complot to have as many of them killed as possible before they can return. It is up to the government to prove otherwise. For humanitarian reasons and for those who don't want to stay because that was not their intention and they don't want to die fighting other Syrian rebels but fighting a dictatorship who without much regret already killed more than 100.000 of his own people.