This is all too convenient. The manifesto to enrage wannabe Nazis. He uses guns, knowing that this attack will be used to further the gun grab agenda. He had other means of attack, but preferred not to use them.

He has military training.

His money comes from bitconnect. That also means he has no proof where it comes from. CIA/Mossad could easily be behind him.

Who knows what evil lurks in the hearts of men? The Shadow Do.