It's not just your own values, it's the effect that your values have on civilization as a whole.

I see civilization as a race between our ability to create problems and our ability to solve problems.

You can make a case that a high reproductive rate is a social danger because it causes resource depletion and overall causes us to develop problems faster just because more people make more problems.

On the other hand, a low reproductive rate makes problems too. It's much easier to fund the kind of welfare state that the left wants when we have a high reproductive rate. The dreams of the right, in which many of us can save money in individual accounts and enjoy an easy retirement, are also dashed by a low reproductive rate.

Honestly I don't know what the optimal reproductive rate is. But I think there is something more to life than the quality and quantity of your orgasms, what pleasure you get, and the self-aggrandizement you experience making other people rich and famous.

Quite a few people have worked hard to create the civilization we have, and in particular, two parents invested a lot to raise me. I think it's fair to "pass this forward" and expect that we all produce (on average) a child each and that that's just a part of the mission we have on planet Earth.

That's just your opinion that having children when older is harmful to society. But what I consider more harmful to society is this thinking that every single individual action has to be weighed against the "benefits of society". This thinking seems to be more and more prevalent and is dangerous for freedom.

What's your primary purpose as a human?

The universe has so far remained silent on the question. It's vanishingly unlikely that I have any objective "purpose," but that's only my opinion.

If you don't think you have any objective purpose, then why did you bring it up?

If your primary purpose as a human being is to reproduce

As a subtle rhetorical way to suggest that OP should maybe get over himself.

Our purposes aren't objective. They are ours to choose, as individuals. Other animals may live only to propagate their genome, but as humans, our societies appear to function best when we convince ourselves that we're here to accomplish things other than reproduction alone.

How about the purpose of teaching our children better?

That's what PaulHoule is talking about in the original comment http://news.ycombinator.com/item?id=4419805