I'm willing to accept the duality of this situation and that issues in life are full of nuances that are not so easily dismissed as entirely one thing or anothe

I'm willing to accept the duality of this situation and that issues in life are full of nuances that are not so easily dismissed as entirely one thing or another. I'm curious, for those that seem so absolutely certain that things are only exactly one thing, where does this confidence come from? I have yet to see any evidence that life is that simple.