1) Postulates exotic physics and/or requires a change to the laws of physics to be possible. Low probability.
2) Postulates bad design and something that the builders would work to minimize. Low probability.
3) Postulates additional exotic physics that are likely different from 1) and don't really even make sense giving the vastness of space. Very low probability.
The search space of ideas is incredibly large, and we don't find solutions by picking ideas at random and testing them. Instead, we focus on the ideas that seem most reasonably plausible, and test those first. There are a LOT of ideas that are more reasonably plausible than catastrophe engines as described above.
Given what I know about physics, I actually find "we're the first intelligent technological life in the universe" to be more likely than catastrophe engines.
I mostly agree with you, but we may disagree on the implausibility of exotic physics. Do you consider all explanations which require "exotic physics" to be less plausible than any explanation that does not? If you are willing to entertain "exotic physics", then are there many ideas involving exotic physics that you find more plausible than Catastrophe Engines?
In the domain of exotic physics, I find Catastrophe Engines to be relatively plausible since are already analogues of similar phenomena to Catastrophe Engines in known physics: f...
The Fermi Paradox leads us to conclude that either A) intelligent life is extremely improbable, B) intelligent life very rarely grows to a higher-level civilization, or C) that higher-level civilizations are common, but are not easy to spot. But each of these explanations are hard to believe. It is hard to believe that intelligent life is rare, given that hominids evolved intelligence so quickly. It is hard to believe that intelligence is inherently self-destructive, since as soon as an intelligent species gains the ability to colonize distant planets, it becomes increasingly unlikely that the entire species could be wiped out; meanwhile, it appears that our own species is on the verge of attaining this potential. It is hard to believe C, since natural selection favors expansionism, so if even a tiny fraction of higher-level civilizations value expansion, then that civilization becomes extremely visible to observers due to its exponential rate of expansion. Not to mention that our own system should have already been colonized by now.
Here I present a new explanation on why higher-level civilizations might be common, and yet still undetected. The key assumption is the existence of a type of Matrioshka brain which I call a "Catastrophe Engine." I cannot even speculate on the exotic physics which might give rise to such a design. However, the defining characteristics of a Catastrophe Engine are as follows:
The Catastrophe Engine is by no means a conservative explanation of the Fermi Paradox, since only the very most speculative principles of physics could possibly explain how an object of such destructive power could be constructed. Nevertheless, it is one explanation of how higher civilizations might be hard to detect as a consequence of purely economical motivations.
Supposing this is a correct explanation of the Fermi paradox, does it result in a desirable outcome for the long-term future of the human race? Perhaps not, since it necessarily implies the existence of a destructive technology that could damage a distant civilization. Any civilization lying close enough to be affected by our civilization would be incentivized to neutralize us before we gain this technology. On the other hand, if we could gain the technology before being detected, then mutually assured destruction could give us a bargaining chip, say, to be granted virtual tenancy in one of their Matrioshka Brains.