Children are literally the entities that make our shared future viable. If we don't reproduce at a sufficient rate we literally, as a species, will not be able to sustain our own existence. And considering how much more personally expensive (both in yes of resources and one's self) we have made raising children over the years it's the absolute opposite of selfish to have them.
How many people have you met that tell you that they're having children because they want to ensure the future of humanity? I'd bet not many, if any at all.
What you describe might be considered selfless, most parents have kids for fairly selfish reasons. There's (usually) nothing wrong with that, of course, but let's not try to paint a rosy picture that doesn't exist.
