some do it because they think it gives them internet credit, as posting clubs, NRA status. Sometimes it to show that they know what they are talking...
My grandfather live through the great depression and had little to nothing. When he died they found rolls of pennies in wrappers and hundreds of jars...
They seemed more communicative, and cooperative, back then. Everyone giving up something (a little bit), instead of a few doing all the work...maybe...
If you look at the early portion of the video, he looked very keenly aware of his surroundings...so I suspect he was looking in his vehicle rear view...