There are two extremes. One is clearly detailed in this article; The other extreme is those that do not leave their home city because everywhere else is "unsafe".
I hope I"m closer to the middle, but fear I'm probably more cautious that that. I'm not telling anyone how to live their life, but I do think people should be carefree enough to enjoy reasonable travels. However, any reasonable person should be able to observe that traveling through ISIS territory as these did would be foolish.
The couple in the linked article were too idealistic, too naive, and probably too attention seeking. They wanted to be able to claim on social media, to friends and family, etc that they were the ones that went and "proved" that ISIS/Radical Islam was not a problem. Well, they made the news alright. I do feel sorrowful for them. It doesn't sound like they were bad people, had bad intentions, etc; They just had a different world outlook and died because of it. Hopefully their deaths are not in vain, hopefully someone with a similar viewpoint to theirs will see this and reconsider certain viewpoints.