If these individuals are rendered stateless somehow, I wouldn't be adverse to them being handed over to the Syrian or Iraqi authorities to deal with.
They left their home countries, renounced their citizenship (and worse, in some cases), to go and join and potentially fight for, an organisation that is responsible for some truly heinous crimes, often knowing those crimes were being committed before they left.
By doing so they supported those attrocities. The group they joined committed those acts in, and against the people of Iraq and Syria.
If the authorities of those countries want to execute these people, I have no complaints.
Actions have consequences.
They left their home countries, renounced their citizenship (and worse, in some cases), to go and join and potentially fight for, an organisation that is responsible for some truly heinous crimes, often knowing those crimes were being committed before they left.
By doing so they supported those attrocities. The group they joined committed those acts in, and against the people of Iraq and Syria.
If the authorities of those countries want to execute these people, I have no complaints.
Actions have consequences.
Playing Cluedo with my mum while I was at Uni:
"You did WHAT? With WHO? WHERE???"