It seems that in political/philosophical discussions, no matter what you’re talking about, someone will attempt to argue against your view by injecting “nuance” into the debate. Or at least, they’ll explain how the difficulty of the questions we’re discussing means that we should hesitate to claim confidence in our beliefs. The tricky thing about this is that it is, indeed, important for us to recognize our epistemic limitations. But it doesn’t follow from this that we ought to suspend belief whenever questions are too complex for us to be certain of our answers to them.
People on both sides of the political spectrum do this. For example, I believe that the Civil War was about slavery, at least for the parties who had the power to make decisions relevant to the waging of the war. Some people I know who are right-of-center on the political spectrum argue that other factors (usually states’ rights or economics) were significant enough that it would be inaccurate to say that the Civil War was about slavery. Which is fine. That’s something we can discuss. The problem is when people say my view lacks nuance as if that in itself is evidence against the truth of my view. It’s not. If my view is wrong, it’s wrong because it’s wrong, not because it lacks nuance.
Likewise, those on the far-left are not so enthusiastic about attempts to define human nature. An attempt to say what it is to be human is likely to be met with claims that humanity is far too complex for us to understand its essential features. I’ll be the first to say that I want to be careful when it comes to making bold claims about the nature of human existence. But that doesn’t mean that we shouldn’t make such claims at all. In fact, to dogmatically cling to the formula that human nature is indefinable is to make a dogmatic claim about human nature, viz. that it is indefinable. The argument that humanity is too complex for us to know its nature not only fails to present a substantive challenge to my views, but also includes a dogmatic claim about human nature that seems to be defeated by the argument itself.
Some things are nuanced. Some things are not. The merit of a view does not depend on the view’s nuance or lack thereof. It depends on whether the view is true. Just because a question is hard doesn’t mean it doesn’t have an answer, nor does it mean that my answer is wrong.