The reason there is so much hysteria directed at Flynn is not Russia. The Democrats don’t care about Russia; that’s all just kabuki- what they care about is protecting Iran at all costs.
http://www.weeklystandard.com/top-intel-official-al-qaeda-worked-on-wmd-in-iran/article/2003264
John Kerry and his ilk have been running quite the cover-up on behalf of the Iran lobby and a few repubs have been, too, and the press has been a willing accomplice.
http://www.businessinsider.com/brazils-iran-argentina-nuclear-ties-story-2015-3