The problem is that the Dyson Dilemma is predicated on the idea that these other civs will have the same general technology and needs that we do. How do we know that they aren't energy beings that absorb entropy or some other bullshit that's impossible by our models? The second one of these underlying assumptions doesn't apply or is incorrect (which, as any respectable scientist will tell you, is an inherent risk of the empirical method), the entire dilemma risks going out the window.
Alternatively, what if the various phenomena we assume are natural to space are in fact the signs of life and technology we seek that we are instead disregarding because we assume their presence to be natural instead of artificial? What if they do have a system set up on our star to harvest energy and it just so happens to make it look the way it has for the last several million years? I guarantee there's nothing on this planet that they couldn't get on some other planet with no inhabitants except for organic compounds, but even then the question would be why they needed those in the first place?
The problem ultimately boils down to the fact that, as humans who have only ever known other humans, we have no reference whatsoever as to the nature or technology of aliens. Maybe they're also matter-based beings that need much of the same things we do, but even if that is the case we're assuming that they'd be subject to the same limitations of technology that we are, when in truth it's very likely that something out there has been around for millions of years longer than we have, with technology to match.>elaboration
Okay, I see now. I was under the impression that you were saying that humanity was the ones that had the inexhaustible resources and the obliterating weapon that nobody could defend against. That said, it's very possible that some sufficiently advanced society has developed defenses against that sort of thing; technology we can scarcely comprehend at this point.