I just checked the tag in the bottom right of the pic. worth1000.com is a Photoshop contest page. Check out the Unauthorized Far Side Tribute. There's some funny stuff there.
As long as they don't make money, it could be considered a parody.
Course, we could make our own showing how much better it is to be robbed by Jackbooted Thugs instead of a street criminal and attribute it to the Brady Campaign.