Why? Thanks to his own court filing and the DOJs response, now we know:
But by giving DOJ the opportunity to present this 302 for publication, Flynn provided proof of what has been hidden all this time — why Trump responded to the way he did about this investigation.
Flynn lied to hide Trump’s involvement in all this (and, to an extent, the degree to which it involved specifically ignoring a heads up from Obama).
Flynn lied to hide Trump’s personal involvement in telling the Russians to hold off on responding to Obama’s sanctions. And when the FBI investigated those lies, Trump fired the FBI Director to try to end that investigation.