. >>> joining me is barry spodak who is a threat assessment expert who has worked with a number of federalaw enforcement agencies and we have learned of your expertise from your daughter who is ale va youed member of t-- who is a me of our staff and a valued member at that. and i want to go to something that governor hickenlooper said. we have no excuse, but we would like to understand what this is all about? >> in terms of motivation, candy, what pushes people to do acts like this comes from the work of robert fine and others who look at what makes people becomes a sas s-- assassins, an even though we don't know the specific motive in this case, we know that the most common motives of people who carry out acts like this is one to draw attention to themselves, and gaining notoriety or fame, and in some cases to perceive what they see to be an injustice, you know, to avenge something that was done to them. to bring attention to an injustice that they see going on elsewhere in the world or in some cases to create a permanent connection between them and a person, event or place. >> john hinkl