Hopefully Turkey does the honorable thing, recognizes an independent Kurdish state and apologizes for decades of oppression, murder and state-sanction terror? Unlikely though.
It feels to me that when HNers agree that a people should be sovereign (the Kurds), they ignore the terrorism. When they don't agree (the Palestinians), the terrorism takes center stage.
Not condoning the attack, but it's also not that black and white. It was an attack on a defense contractor.
Some guys doing bad stuff, say other guys doing bad stuff are really bad - trust us - and thus have them added to the definitive naughty list. In case you're in any doubt, there are lots of bad people and folks out there, but believing there's one definitive list is pretty much Western chauvinism writ large.