Sure everyone has a convenient answer to the Fermi Paradox, but nearly all of them fail the non-exclusivity test. While some solutions to the FP may account for many if not most of the reasons why we haven't detected signs of ETI's, they cannot account for all.
For example, take the notion that interstellar travel is too costly or that civs have no interest in embarking on generational space-faring campaigns. Sure, this may account for a fair share of the situation, but in a Universe of a gajillion stars it cannot possibly account for all. There's got to be at least one, if not millions of civs, who for whatever reason decide it just might be worth it.
Moreover, answers like the ‘zoo hypothesis,’ ‘non-interference,’ or ‘they wouldn’t find us interesting,' tend to be projections of the human psyche and a biased interpretation of current events.
Analyses of the FP need to adopt a more rigid and sweeping methodological frame.
We need to take determinism more seriously. The Universe we observe is based on a fixed set of principles -- principles that necessarily invoke cosmological determinism and in all likelihood sociological uniformitarianism. In other words, the laws of the Universe are moulding us on account of selectional pressures beyond our control.
Civilizations that don't conform to adaptive states will simply go extinct. The trouble is, we have no say in what these adaptive states might be like; we are in the business of conforming such that we continue to survive.
The question is, what are these adaptive states?
Transhumanist philosopher Nick Bostrom refers to this as the strong convergence hypothesis -- the idea that all sufficiently advanced civilizations converge towards the same optimal state.
This is a hypothesized developmental tendency akin to a Dawkinsian fitness peak -- the suggestion that identical environmental stressors, limitations and attractors will compel intelligences to settle around optimal existential modes. This theory does not favour the diversification of intelligence – at least not outside of a very strict set of living parameters.
The space of all possible minds...that survive
Consequently, our speculations about the characteristics of a post-Singularity machine mind must take deterministic constraints into account. Yes, we can speculate about the space of all possible minds, but this space is dramatically shrunk by adaptationist constraints.
The question thus becomes, what is the space of all possible post-Singularity machine minds that result in a civilization's (or a singleton's) ongoing existence?
And it is here that you will likely begin to find a real and meaningful explanation to the Fermi Paradox and the problem that is non-exclusivity.