Normative Signs: The Poetry of "Ought"

This sign seems radically under-informative to me.

Aren’t there overhead powerlines just about everywhere? And aren’t they generally safe, so long as you don’t do something stupid like climbing a pole without proper gear and training?

And if you do something stupid like that, aren’t power lines always dangerous? So, what makes this situation/location special, such that it warrants a warning sign? There’s no evidence here of a special danger — no dangling powerlines. Perhaps (given the wooded location) the danger is to workers cutting / trimming trees. But then, why not say so? Besides, such workers are typically hyper-aware of such dangers.

The sign is posted on a trail adjacent to a suburb on the edges of Ottawa.