The guns versus no guns indicates his line of thought.  People who were there unarmed protesting were part of the "We" and those that were there armed are not part of the "We".

 Kind of like saying we were at a parade and none of us were armed, but there is video evidence of a guy with a gun on his hip so I am complicit, and lying about being there with guns.

 Am I?  If I go to a parade unarmed with 10 humans and say "we" went, am I lying if any of the other humans besides the 10 I went with are armed?