Love Lost Forever - What were they thinking?

Yesterday I read about two Northern Virginia teenagers that were found dead from gunshots. It was initially not known whether this was a murder/suicide or a joint suicide. It was just recently revealed in separately written notes, the 15-year-old girl and the 19-year-old boy, who were dating, committed a double suicide because their parents disapproved of their relationship. The two teenagers were both healthy, well liked, and seemed to have promising futures. But then again, at 15 and 19 respectively, it seems no matter what your circumstances, you have a promising future. So what gives?

I can understand a parent not wanting his or her 15-year-old daughter dating someone 4 years older. I went through that experience at 15 as well, and I can tell you, there was a HUGE age gap between myself and the 19-year-old I dated. My relationship was disastrous on numerous levels - especially the end - I can still recall the gut-wrenching pain- but never once did I contemplate suicide. I knew at 15, as I know now, no one is worth killing yourself over. And yet, Kayla and Tony thought otherwise. Are we living in the time of the Montagues and the Capulets or the 21st Century? What values are we instilling in our children? What are we teaching them? Why, for god's sake was a gun available to them, and not locked away?

And now, in the first few days of the new year, when everything still has that new, fresh out of the package smell, and feel, and the world seems full of promise, how could two teenagers think there is nothing left to live for?