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There is a list of organisations that the government has made it illegal to attempt to join or to support on the grounds that they will use acts of terrorism in order to achieve their aims. PKK is on that list. That PKK is currently fighting against ISIS isn't really relevant. If a state holds that terrorism is a bad thing, we can't then give a free pass to a terrorist organisation just because they're fighting a common enemy. We can't work in concert with them and we definitely can't gain any assurances that they won't carry out acts of terrorism and/or aggression against us or other states or organisations we're allied with.
The_Seldom_Killer-
Our government seems to have no qualms about providing support (and allegedly arms) to proscribed terrorist organisations through.
The case seems to have parallels with this one: http://www.theguardian.com/uk-news/2015/jun/01/trial-swedish-man-accused-terrorism-offences-collapse-bherlin-gildo
Prole.
http://www.theguardian.com/uk-news/2015/nov/20/girl-becomes-first-briton-convicted-of-trying-to-join-fight-against-islamic-state-in-syria
Can someone please explain to me how our government can convict some for attempting to fight against a terrorist group that our government are supporting the fight against?