It's interesting (and quite guilt-inducing) reading some of the perspectives on here.
As a PP said, going overseas (invariably long haul), is a right of passage for most NZers and Australians. Most parents expect (or suspect) their children will do it, and are (thankfully) supportive.
Many of those travellers end up back home. But a significant cohort don't, for one reason or another.
My DH spent a year in Australia in the late 90s. One year before I left NZ to travel to London, ironically. His Mum was extremely relieved when he returned home.
We met in London several years later, married and had kids. We made the decision to move to NZ when my widowed Dad got ill. My brother was also in London, so although Dad had a wide circle of family and friends around him, he didn't have his children, nor his brand new grandchildren.
So we made that move as a family. DH's parents - I know - were heart-broken. But they didn't show it, and have never been anything but supportive of us.
Reading posts like speakout's makes feel bad for what we've done, but either way, we were going to upset one or other of our parents. We chose to be closer to the one who was widowed, who was sick, and who didn't have any children or grandchildren near (PILs do have that, although it doesn't make not having close that much easier).
It would be so much easier if everyone just stayed in their home town, met a nice chap from around the corner and stayed close by, but life isn't like that. And we do the best we can - any insinuation that we don't care about our parents enough couldn't be further from the truth. People who haven't been in this position don't understand the half of it. Especially if they're basing their opinion on one errant sibling of their own.