Media might be part of it, but I think it's a little deeper than that, it's an issue with society and norms. I've learned as a scientist a bit more about giving presentations than I thought I ever would, and something I've been told time and time again is that you act with confidence; the smallest hint you might doubt what you're presenting can be damaging to how people will receive your message in the first place. This is a bit general in society, people often equate confidence with truth and accuracy, which is not necessarily a good correlation.

Because of that, scientists are under pressure when presenting to the public to downplay their doubts or not mention particular points they are unsure of. That's why issues in science don't get airplay even though most scientists are aware of issues in their own field.

The reality is that reality is complicated, and people's perception of reality is even more complicated, so it's no surprise that science is a very hairy thing with a tinge of uncertainty at times. However, the outsider's reaction to that is to respond to it with binary reasoning, saying that, "this means they're wrong because it isn't 100% true" instead of how scientists really see is, as "85% true, so,almost right."