Why Didn't He Notify The FBI?

I think you're getting to what might be the heart of why Mueller came to no conclusion on obstruction: Trump's intent, and the difficulty of proving it.

Normally you prove corrupt intent by circumstantial evidence and the key is often finding that a defendant lied on one topic but, otherwise, was fairly consistently truthful on others. He doesnt tell the truth consistently on any topic, and as a result, statements or actions that might be seen as probative evidence for most people aren't really probative or compelling with regard to Trump.

Trump doesn't work that way. He seems to say things with little concern for whether they're objectively true or and often whether they're consistent with what he's said before.


Much has been made of the fact that this would have made him vulnerable to a "perjury trap", but I think it may also have played into why, absent sworn testimony and cross examination, Mueller might be unable I come to a conclusion in whether there was sufficient evidence to prove corrupt intent.