Why worry about Turkey?

So now Turkey is mad at Sweden for adopting some sort of resolution calling the killing of Armenians in 1915 genocide. Here, I can get worked up in several different ways. For instance, doesn’t Turkey have better things to do than worry about what other countries call an event that took place during Ottoman rule? And why does this particular event deserve endless attention decade after decade? Or rather, not the event in itself but what people should be allowed to call it.
Mostly, however, I wonder why the Swedish government feels the need to say anything at all about it. Is the government’s job not to take care of its citizens? Why are they wasting time commenting something that took place in another country 95 years ago?