Prove it. Show that he instigated the violence. Incidentally, merely being a Nazi is not proof (it's reprehensible, but it's covered under the First Amendment). To blame him, you have to show he got physical first.
Vehicles attack have been done by ISIS multiple times this year in Europe.
Name an ISIS attack in which the terrorist was fleeing infidels. It takes a moron to connect him to ISIS.
I’ve provided three videos to you. They show a car driving down the street and directly into a crowd of people.
Here’s a photo.
http://cdn.thegatewaypundit.com/wp-content/uploads/crash-pic.jpg
Here’s another video. It shows a person being struck by his car and then landing on the roof of the car in front of him.
https://twitter.com/Breaking911/status/896451158319013893
And another video. Note the people flying through the air before the car becomes visible. Note the people flying through the air and striking the car in front of him. Note the people being thrown to the ground.
https://youtu.be/9mnywjPPDtU?t=12