I don't see how a stand your ground law could be harmful (except for the bad guy). The poll is probably being ran up by the usual suspects who wish to cash in their liberties and let someone else fight their battles.
Wonder if the numbers change on this one. I used one of CNN's "polls" once for a class, and the numbers never changed for anyone who went to the site and voted.
Harmful 60%16654
Helpful 40%11185
Total votes: 27839