In scientific issues this is usually solved as the puzzle becomes more full in picture. In other words, the spaces that are unknown can be filled with theories and those can change what people think about an issue, but when everything and every piece of the puzzle is filled, the image is complete and everyone can be on the same page.
In social issues, or politics, it's never that simple. There will never be a complete puzzle solved on any issue that we can lay to rest. Because we create them. We define their parameters and what they're meant to do. And at any point, anyone can come and say that the puzzle is incomplete or that the image we created, so what the puzzle produces, is the wrong one and that he has a better one. And it may be true or not... it may be true for some people and false for others. It depends what we want. I'm basically just reinforcing what I think it is you wanted to say.