Turkish workers are not terrorized if they do not know that the victims were killed just for being Turkish workers. To borrow from my signature quote: “terrorism [is] almost exclusively about branding, but only slightly less so about the psychology of lotteries”.
Interesting points, since terrorism is normally viewed as violent political messaging, so are the crimes committed by this group terrorism or rather just murder? When the KKK was conducting similiar hate crimes in the U.S. they made quite a show out of it to spread terror, so in my view it was clearly terrorism. If a group of "true believers" get together to kill Jews, Turks, Drug runners, hookers, or whatever group they have a beef against and they don't advertise it, or execute the murders in a way to propagate a message of fear is it is terrorism or hate crime without terrorism being involved?