Is this along the lines of: 'Life will find a way?' I guess that's true. It's probably difficult to stop life fighting to come into this world.
How different would our lives have been if we'd been 'born' a fungus, virus, plant, bird, fish though? Even a human to different parents? A lot of creatures on this world seem to be so dominated by instinct. I doubt it even occurs to them that they have a choice not to reproduce. So in their case- sure, it could well be an unconscious drive they have little control over.
That's where humans are different though. We are capable of reasoning. We are capable of keeping control of our primal urges.
So, it's absolutely our parents decision and fault we are here. It's absolutely their decision to give their children half their genes, including the propensity to certain illnesses, the likelihood they will be good and bad in certain subjects.
They ought to be able to look at their own lives and struggles and think- do I want my child to struggle like this? Chances are, they might- with half their genes. Also- to just take a look around them. Can they afford to feed their child? Do they live somewhere safe? Will their child have good prospects to be able to support themselves one day, given the kind of start in life they will be able to give them? What's the state of the world in general? Looking good? How will it likely look in 30, 60 years time?
Humans are perfectly capable of thinking about all of this. We're not mindless animals. There are also a huge amount of people now making the decision not to have children now. Antinatilism is growing fast enough for there to be articles written panicking about it. How did those people refrain from the inevitable? Were they fated to reproduce but somehow, escaped?
We can't blame our parents for life itself having come about but our particular lives to them? Sure we can. They went ahead despite knowing the probability of risk to danger we would encounter.