That's not what the comment you were replying to (I'm going to avoid using terms like "parent comment" in this particular discussion as they could easily be ambiguous, heh) was saying. You may have missed the part about how "they thought about it a lot before going ahead" (emphasis mine), and also the part about "even if they know the sacrifices they [the parents] will have to make".

Personally, I know (online rather than in person) at least one couple who thought about it a lot, and ended up deciding not to have kids, because they were both carriers of a recessive gene (I forget which) that could have been nasty to whatever kid ended up with both copies. Which is kind of the opposite of "completely ignor[ing] if their kids even have a chance of a good future", IMHO. Other parents thought about it and decided to have only a certain number of kids and no more, because that was how many kids they could afford to raise and launch into a path that potentially leads to a good future.

Now, are there people who have kids for selfish reasons? Yes. I can think of some examples. But the people who think about it a lot and end up deciding to have kids? They're usually (not always, of course, but usually) some of the best parents around, precisely because they've thought about the sacrifices they would have to make and decided they're willing to make them for the sake of their kids' future happiness.