The dailydot says he was never charged for murder, which isn't true; http://www.npr.org/blogs/thetwo-way/2015/02/04/383870485/ros... says that he's pending trial in Baltimore.

Also, the government thinks he didn't actually get people killed, but that he was tricked into thinking that he had.

Why would Ross admit to founding Silk Road if it wasn't true?

This wasn't the only evidence; there were large bitcoin payments directly from Ross's wallet, as well as journal entries. Ross is a known liar, as he claimed not to be the founder of Silk Road before admitting he was, so I don't trust what he says.