A few years ago, a good family friend, someone who I got to know quite well towards the end, committed suicide and it was just awful, because there was just this sad inevitability about it. I could see her light, her spark slowly whittle away as she had to endure crippling back pain, a doctor that seemed apathetic about her whole situation, almost to the point that he would gladly struck her off if he could and a system that had failed her time and time again.
Suicide isn't selfish, it's the last desperate act of a broken mind that sees the world completely differently to a healthy person; a mindset that believes we'd be better off without them. She obviously didn't want to endure the pain anymore, and she felt like she was such a burden to everyone, it always me sad to think how apologetic she was when she was down; in those last six months she was always apologising, and it felt like we couldn't quite communicate that it was ok, it didn't matter. I sometimes think of those last few moments before she killed herself, and how alone she must have felt, it breaks my heart, but, at the same time, I'm glad that she doesn't have to endure all that pain anymore.
Of course, that's my experience. When people throw that remark around, I take it as a sign that they've had the good fortune not to go through such an experience.