For instance, does the available evidence support the conclusion that this new thing causes cancer? Yes or no, please.
Which new thing?
As I said, humans are fallible, we have disagreements about factual matters. If we were all perfect judges of evidence, then all scientists with access to the same information would agree on how likely it is that some thing causes cancer. Sometimes making judgments of evidence is hard, sometimes it's easier. That doesn't mean that there isn't a right answer in each case.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.