Wow! This is a thread and a half.
There seems to be people coming at it from all different angles; environmental, emotional, social, scientific and species.
I think my view aligns with that of Haakon. I think.
But I will be quite specific in the framing of my opinion, I am looking at it as a case of evnironment vs. native species and sustainability.
Long story short, the human species is breeding out of control.
The thing about every other species on the planet is that there is a natural order and balance to keep it in check. This this is why environmentalists loose their minds about introduced species.
Humans, are an introduced species pretty much everywhere on the planet at this point, and we are also the dominant species everywhere we are introduced. This means we have a massive impact on the areas we are introduced into and it's a negative impact. Always a negative impact.
The other issue is that as a species, we are not longer progressing, but rather regressing. This is on a genetic level.
You look at every other creature on the planet and it's survival of the fittest/smartest. This ensured that the numbers of a species are sustainable for that environment AND it ensured that with each generation, the genetics of the species improve.
However, with humans, we've managed to cheat nature. We are not able to sustain individuals, actually no, MASSES of our species that have genetic defects. I can't find the article now, but I recall reading something about that if all modern medicine disappeared tomorrow, the human population would very quickly 're-adjust'.
So we are a species that is dominant in all environments we are introduced into, we are a species that has a significant negative impact on the environments we are introduced into and we are a species has overcome all of the natural ways other species populations are controlled at a sustainable level.
LONG story short, unless something changes we will destroy our environment and ultimately ourselves.
So coming back to the topic of 'are all parents selfish environmental terrorist arseholes driving us in to oblivion?'
Yes and no. Yes because procreation is a base function to ensure the survival of the species. As a species we are in no danger of extinction therefore the decision to procreate is for personal reasons.
Given the loose definition of selfish is 'chiefly concerned with one's own interest, advantage, etc, esp to the total exclusion of the interests of others', this is exactly what the decision to have offspring is. People want to have a child for their own, self serving reasons. Technically selfish.
In terms of the 'no' component of the answer, I don't believe that all parents are terrorist arseholes. While out need to procreate from a species perspective has long being lost, our instinct to hasn't.
Every species on the planet has two base drives; survive and procreate. So really can't blame people for having kids.
For me personally, I don't particularly have a desire to have children as I don't really see the point, but at the same time I don't not want them either. Given my wife REALLY wants them, I see a couple mini-Jesters in my near future.
So maybe I've a selfish arsehole too.