Well, perhaps he means "a good thing for the natural environment and some of the other living creatures besides US!" (The great "us", remember? The guys who think they are the owners of the planet, the Masters of Creation, and the greatest thing since Tyrannosaurus Rex?)

The fact is, teribus, there are way too many people on this planet already and there's getting to be too little of everything else. Not a good situation. I have no simple, elegant solution other than a massive worldwide birth control program which most people are apparently unwilling to engage in. I've done my bit. I have sired no children in this life, and it was by design, not by chance.

Besides, I figured I'd have made a really lousy parent anyway... :-) The domestic life is just not my forte. I can imagine doing about 5,000 other things better than raising a family. My opinion is that most people have children partly because they want to, partly because it just happens anyway, partly because it's fun trying, and partly because they think they're SUPPOSED to! I never thought that for a moment.