Earlier quoted context omitted.
I like the Zoo hypothesis. We do that to North Sentinel Island[1]. It is populated by 50-400 stone age tribes people. India does not prosecute them for murdering anyone who happens to land on their island. Previous contacts with these people led to them rapidly dying of diseases they didn't have immunity to, so staying uncontacted is literally a life or death issue for them. [1] https://en.wikipedia.org/wiki/North_Se…
I think it's bizarre that the fact that we have absolutely zero evidence for aliens actually gives a little weight to things like the zoo hypothesis.
That is evidence in the abstract sense and we currently lack the technology to observe these candidate planets in enough detail to test the models further.
We're like a person sitting in the desert at night with nothing but a candle concluding that the planet is completely deserted because they can't see anyone else.