I can see both sides but the side of the experts can clearly do better here. “It’s too complex to explain to all you people” or “this isn’t really a problem, the documentary makes a mountain of a mole hill” aren’t good approaches. If you are an expert in a field you should have at least some ability to simplify the issue or point out the mitigating factors that the documentary missed.

The much more likely explanation here is that experts have a vested interest in looking smarter than some guy with a camera so they furrow their brows and talk about the complexities of the issue.

As an analogy, BitCoin is complex. Between its usage of a blockchain and energy usage and murky origin story with who knows who owning a large chunk from the get go. Yet you could probably explain the power consumption problem to someone pretty easily.