You also need to keep in mind that the DEA doesn't give a shit about Iranians but does give a shit about SR. Yes the concepts for Tor came from the USA Navy. Tor wasn't implemented by them though, it was implemented by someone who worked for NSA prior to implementing it though. It gets a significant amount of funding from the U.S. government. People who run exit nodes have been raided by various agencies, from federal police to intelligence.