While I really like the concept, I2P is one of those P2P network strongly associated with the darkest corner of the Internet in my mind and something I would rather stay away from (because I would rather not get arrested randomly because I have used it).
Now I was just going through the I2P Wikipedia page and I couldn't find anything about that. Are my fears irrational?
They do that because Tor users are a minority. The only way to combat this sort of discrimination is to convince a large number of people to use Tor. They can't afford to single us out if everyone is doing it.
I don't think authorities worry about I2P at this point, it is too small and requires some technical expertise to use. It is however much more anonymous and privacy-preserving than Tor, so yes, some corners are dark enough (you will rarely encounter them unless you want to go there, and from technical point of view, I2P is really interesting).
I think there is a basis for such worry, "Why Nation Fails" highlight the aspects of corruption and non-independent/transparent judiciary system and absue of police force as a big reasons why countries fail. And if you want to compare western police force corruption to others, I invite you to check what happened in egypt 10 yo.
Because spouting off the name of one person wrongfully convicted is meaningless. I didn't deny there are miscarriages of justice in any country. Iran's civil rights record is among the bottom in the world, bested only by NK and other hell holes.
In 3rd world countries they don't care about piracy, drug dealing, or inappropriate content, but they do care about what you're saying about government. In first world countries it's the exact opposite, you can openly criticize government, hell you can make fun of politicians, but better watch out when looking for pirated content.
Now I was just going through the I2P Wikipedia page and I couldn't find anything about that. Are my fears irrational?