Not trying to pin anyone here, but people will sometimes joke about it because they are too immature to cope with it like most of us do.
I was going to reply to that guy, but i think a portion of my response would have seemed disrespectful, so I'll bite my tongue. I know someone personally that was on MH17. A very close friend of mine, I suppose i could say that she was like a sister. And every single minute, of every single day, it dawns on me a little bit more that she wont come back. That she *cant* come back. That in and of itself hurts. I've dealt with loss many times before, but its never been like this. There has always been something that i could have done to stop it, or at the very least make it better. Now, theres nothing I can do, and I dont know what to do about it. Sincerely, my heart goes out to the families, friends, acquaintances, coworkers, or anybody else that has lost someone from MH17. Just keep going, day by day, and it will get better.