What makes the dark forest hypothesis not so conving to me is that it has the presupposition that it is indeed possible to hide. An advanced civilization close to us that is surveying the sky for signs of life would have very likely identified earth as a very promissing candidate due to the presence of methane and oxygen in its atmosphere at the same time. So our star system would have long been under surveillance, before we had the chance to develop a technology that would reliable disguise our presence.
If such a technology is possible at all, only the very first advanced civilization had the ability to hide from all others. And only if they were able to develop it before any other civilization had been able to track them.
To some extent it might nevertheless be a reasonable strategy to keep as quiet as possible. But this strategy is less and less useful for the latecomers. If they were already tracked by a multitude of other advanced civilization they would hardly benefit from keeping quiet. Unless they (wrongly) think that they are an early advanced civilization.
However, if a couple of these civilizations start to openly seek contact to others, what can the hidden ones do? If a hidden civilization starts to fight one of these latecomers, it would need to leave its cover and make itself known to all other civilizations in its vicinity. If it follows the dark forst hypothesis, it could only do so, when it is sure that it is the only dangerous civilization in its forest.
This leaves me with the following alternatives:
- The forest is dark, because there is only one civilization out there that is very capable in hiding and has the ability to exterminate any latecomer efficiently and without traces.
- The forest appears dark, because it is thinly populated and we just have not looked enough for the others.
- We are the only ones in our cosmic vicinity.