Yes, but maybe his children will contribute in massively positive ways that end up negating their negative climate impact.
Every child is also a chance.
And maybe I'll win the lottery and escape poverty, but playing it is irresponsible while I'm poor
Maybe but it's extremely unlikely. Think about the amount of damage a single person does to the environment. It would take a truly insane effort for someone to have a beneficial effect on it (assuming the live in civilisation).