-Thank you theymos for the clarification,I really appreciate that.
I also hope that you will implement the public-key-registration system in the near future as I'm sure alot of people living in countries banning crypto are also worried about tracks they leave behind them please don't forget us.I'm a bit more reassured atleast not all actions leave permanent IP record
-Correct me if I wrong but I don't think that Tor having nodes backed by the NSA would cause a lot of troube to users as a node can't directly link to your real IP unless all the nodes your tor client picked are backed by the NSA
You would be correct.
The more end nodes you control in the network the more likely you are to control all the nodes in a circuit. If the NSA or any entity for instance controlled all nodes within the circuit you are using then they would be able to determine the IP that you use. This is why more nodes means more security, because it's more unlikely for one entity to control all the nodes. Although, with the spending power, and resources of someone like NSA there are concerns from a select few.
This probably isn't too much of a concern for someone who's accessing a forum that they aren't suppose too, but it's quite well known that journalists use the Tor project to communicate with "whistleblowers" and the like, and you can imagine why the government would want to listen into these. The motives are there, but I'm skeptical of how much of a problem it really is.
If you want extra protection some people connect to Tor via a VPN. Then you have to trust that VPN provider.