Brought the wrong weapon - but there are a lot of liberal types that thought as this guy did, that a bow and arrow would work just as well in a defense situation so why do we need those icky guns?
They are, of course, horribly wrong.
Maybe not wrong, just not up to speed with the latest tech:
Note: advance the tape to about 6 minutes in if pressed for time. Also, this guy has been working on this idea for some time and has other prototypes/videos.