You are trying to talk to an eel.
It's pointless
I didn't think anyone could get you and I on the same page, but this guy did.
He can't understand that Timothy McVeigh happened when I was in elementary school (I'm 27 now.)
He can't understand that Anders Brevik committed his atrocity when the Iraq war was still being debated.
He can't understand that the Klan has been reduced to 5,000 hicks spread out over 50 states, who haven't committed a terrorist act in decades.
He can't understand that the anomaly of Dylan Roof is a Tuesday afternoon for ISIS.
He can't understand that ISIS is one face of a thousand-headed dragon known as Islamic terrorism.
He can't understand that there have been 28,000+ documented terror attacks since 9/11, which was only 15 years ago. To give you some perspective, the Klan killed 3-4,000 people over it's lifetime.
He can't understand that Jihad has a 1,500 year old history of conquering by the sword, and wants to blame this on the 250 year old USA.
He can't understand that the example of Jesus was a peace loving hippie, and the example of Muhammad was a pedophile warlord.
He can't understand that he has to turn to the past to find a handful of Christian terrorists. I half expect him to go to the Crusades of 1,000 years ago next.
And then he won't understand that the Crusades were a response to Islam trying to take over the world.