I believe some of the relatives who were executed at the hands of Jihadis, such as David Haynes' daughter did not want this programme to be shown.
It follows immediately after the murder of innocents in Barcelona, Finland and another today in Marseilles. Returning Jihadis are in the serious throes of a sustained campaign to terrorise Europe.
These people didn't go out to Syria led by any high ideals, once there they kidnapped, murdered, raped and tortured the indigenous people of the town and cities they occupied. The women were just as bad, glorifying brutality on social media and some took their innocent children with them. The bat shit crazy white woman, Sally Jones' child was photographed, aged about 11, shooting a kneeling man at point blank range in the back of the head. I haven't watched this programme so can't make a judgement but I'd hate to think the Jihadis were being portrayed in a sympathetic light, or even glamourised by some western apologist. I'd rather see a film about the westerners who went out to fight alongside the Peshmergers, they may have been misguided but at least they went to liberate rather than oppress.